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Can anyone help me with this extremely hard GCSE Maths question.

Its a Non-Calculator question.

Thanks

Its a Non-Calculator question.

Thanks

Easy, form simultaneous equations

3+c= 2

3+a= 3

3+c-2=1

3+a+2= 2

3+c= 2

3+a= 3

3+c-2=1

3+a+2= 2

Original post by ghen_chude_che

Easy, form simultaneous equations

3+c= 2

3+a= 3

3+c-2=1

3+a+2= 2

3+c= 2

3+a= 3

3+c-2=1

3+a+2= 2

Thankyou

(edited 6 years ago)

Original post by ghen_chude_che

Easy, form simultaneous equations

3+c= 2

3+a= 3

3+c-2=1

3+a+2= 2

3+c= 2

3+a= 3

3+c-2=1

3+a+2= 2

From your first equation 3 + c = 2, you get the starting number of children as -1.

Original post by zazzyhazzy

This is wrong I'm afraid.

Original post by haarithiop

This is wrong I'm afraid.

And why so?

I think I've seen this kind of question before and I got it right by stumbling around but let me attempt it.

If in doubt, call the master @_gcx.

Anyway, after a quick check in my revision guide I've got this:

c:a

(c + 3) : (a + 3) = 2:3

(c + 1) : (a + 5) = 1:2

then turn the ratios into fractions...

c+3/a+3 = 2/3

c+1/a+5 = 1/2

cross multiply...

3c + 9 = 2a + 6

2c + 2 = a + 5

rearrange...

1) 3c - 2a = -3

2) 2c -a = 3

solve them like simultaneous equations

1) 3c - 2a = -3

2) 2c -a = 3 X2 = 3) 4c - 2a = 6

3) 4c - 2a = 6

- 1) 3c - 2a = -3

= c = 9

9 CHILDREN

Subs. into 1)

1) 3c - 2a = -3

is now

3(9) - 2a = -3

27 - 2a = -3 (minus 27)

-2a = -30 (divide by -2)

a = 15

15 adults

Ratio = 9:15 but it says in lowest terms so the ratio is 3:5

If in doubt, call the master @_gcx.

Anyway, after a quick check in my revision guide I've got this:

c:a

(c + 3) : (a + 3) = 2:3

(c + 1) : (a + 5) = 1:2

then turn the ratios into fractions...

c+3/a+3 = 2/3

c+1/a+5 = 1/2

cross multiply...

3c + 9 = 2a + 6

2c + 2 = a + 5

rearrange...

1) 3c - 2a = -3

2) 2c -a = 3

solve them like simultaneous equations

1) 3c - 2a = -3

2) 2c -a = 3 X2 = 3) 4c - 2a = 6

3) 4c - 2a = 6

- 1) 3c - 2a = -3

= c = 9

9 CHILDREN

Subs. into 1)

1) 3c - 2a = -3

is now

3(9) - 2a = -3

27 - 2a = -3 (minus 27)

-2a = -30 (divide by -2)

a = 15

15 adults

Ratio = 9:15 but it says in lowest terms so the ratio is 3:5

(edited 6 years ago)

Original post by zazzyhazzy

And why so?

3x9 =27 not 18

Original post by StudyJosh

I think I've seen this kind of question before and I got it right by stumbling around but let me attempt it.

If in doubt, call the master @_gcx.

Anyway, after a quick check in my revision guide I've got this:

c:a

(c + 3)a + 3) = 2:3

(c + 1)a + 5) = 1:2

then turn the ratios into fractions...

c+3/a+3 = 2/3

c+1/a+5 = 1/2

cross multiply...

3c + 9 = 2a + 6

2c + 2 = a + 5

rearrange...

1) 3c - 2a = -3

2) 2c -a = 3

solve them like simultaneous equations

1) 3c - 2a = -3

2) 2c -a = 3 X2 = 3) 4c - 2a = 6

3) 4c - 2a = 6

- 1) 3c - 2a = -3

= c = 9

9 CHILDREN

Subs. into 1)

1) 3c - 2a = -3

is now

3(9) - 2a = -3

27 - 2a = -3 (minus 27)

-2a = -30 (divide by -2)

a = 15

15 adults

Ratio = 9:15 but it says in lowest terms so the ratio is 3:5

If in doubt, call the master @_gcx.

Anyway, after a quick check in my revision guide I've got this:

c:a

(c + 3)a + 3) = 2:3

(c + 1)a + 5) = 1:2

then turn the ratios into fractions...

c+3/a+3 = 2/3

c+1/a+5 = 1/2

cross multiply...

3c + 9 = 2a + 6

2c + 2 = a + 5

rearrange...

1) 3c - 2a = -3

2) 2c -a = 3

solve them like simultaneous equations

1) 3c - 2a = -3

2) 2c -a = 3 X2 = 3) 4c - 2a = 6

3) 4c - 2a = 6

- 1) 3c - 2a = -3

= c = 9

9 CHILDREN

Subs. into 1)

1) 3c - 2a = -3

is now

3(9) - 2a = -3

27 - 2a = -3 (minus 27)

-2a = -30 (divide by -2)

a = 15

15 adults

Ratio = 9:15 but it says in lowest terms so the ratio is 3:5

Correct

Original post by haarithiop

3x9 =27 not 18

Ohhhh crap hahaha didn't see that lol...anyway thanks for correcting me!

Original post by ghen_chude_che

Easy, form simultaneous equations

3+c= 2

3+a= 3

3+c-2=1

3+a+2= 2

3+c= 2

3+a= 3

3+c-2=1

3+a+2= 2

This is wrong

Original post by StudyJosh

I think I've seen this kind of question before and I got it right by stumbling around but let me attempt it.

If in doubt, call the master @_gcx.

Anyway, after a quick check in my revision guide I've got this:

c:a

(c + 3) : (a + 3) = 2:3

(c + 1) : (a + 5) = 1:2

then turn the ratios into fractions...

c+3/a+3 = 2/3

c+1/a+5 = 1/2

cross multiply...

3c + 9 = 2a + 6

2c + 2 = a + 5

rearrange...

1) 3c - 2a = -3

2) 2c -a = 3

solve them like simultaneous equations

1) 3c - 2a = -3

2) 2c -a = 3 X2 = 3) 4c - 2a = 6

3) 4c - 2a = 6

- 1) 3c - 2a = -3

= c = 9

9 CHILDREN

Subs. into 1)

1) 3c - 2a = -3

is now

3(9) - 2a = -3

27 - 2a = -3 (minus 27)

-2a = -30 (divide by -2)

a = 15

15 adults

Ratio = 9:15 but it says in lowest terms so the ratio is 3:5

If in doubt, call the master @_gcx.

Anyway, after a quick check in my revision guide I've got this:

c:a

(c + 3) : (a + 3) = 2:3

(c + 1) : (a + 5) = 1:2

then turn the ratios into fractions...

c+3/a+3 = 2/3

c+1/a+5 = 1/2

cross multiply...

3c + 9 = 2a + 6

2c + 2 = a + 5

rearrange...

1) 3c - 2a = -3

2) 2c -a = 3

solve them like simultaneous equations

1) 3c - 2a = -3

2) 2c -a = 3 X2 = 3) 4c - 2a = 6

3) 4c - 2a = 6

- 1) 3c - 2a = -3

= c = 9

9 CHILDREN

Subs. into 1)

1) 3c - 2a = -3

is now

3(9) - 2a = -3

27 - 2a = -3 (minus 27)

-2a = -30 (divide by -2)

a = 15

15 adults

Ratio = 9:15 but it says in lowest terms so the ratio is 3:5

Yeah this is the correct solution which I tried to do but then forgot my basic times tables hahahaha

The answer is 3:5, you had to make simultaneous ratios and solve for c and a.

- maths revision help
- A level choices for imperial?
- what is further maths a level like?
- 16-18 Education
- can you do cambridge law if you got a 4 in maths
- Is it worth it to do A level Math for medicine
- Maths GCSE/A level
- a level subjects
- GCSE Study and Revision Groups 2022-2023
- Fun maths problem (GCSE level)
- Biology and chemistry
- The Easiest GCSE
- Correlation between performance in UKMT and performance in TMUA/STEP?
- I need HELP picking A-level subjects
- How hard are A levels?
- A level physics without maths
- GCSEs good enough for Econ and Econ history?
- Medicine Application Problems -.-
- Physics a level without maths a level
- 4 A-levels?

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