# GCSE maths Proportions - Could someone read through my answers ?

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Is anyone able to read through my answers to the questions below and tell me if they're right or wrong? If any are wrong I can provide my workings out

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#4

(Original post by

Anyone?

**noodlestopshop**)Anyone?

5 = 7k so k = 5/7

140 x (5/7) = 100

**correct**

2) 37/(5/7) = 51.8

**correct**

3/4)

**correct**

5) y = x^3k

96 = 64k so k= 1.5

y = 5.5^3 x 1.5 = 249.5625

**correct**

6)

**incorrect - here’s some support:**

h = k/ r^2 - substitute the values of h and r to find k:

k = h(r^2) - and now use this to solve for h using values

7) q = k/sqrt(w) so k = 8.68(1.4) = 12.152

12.152/sqrt(4.41) = 5.786...

**correct**

8)

**incorrect - here’s some support:**

q = k/sqrt(w) and k= 12.152

q = 12.152/sqrt(w) so w = (12.152/q)^2 and now substitute in your value of q for w

Let me know if you think i’m wrong - i’m human too!

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(Original post by

1) b = ka

5 = 7k so k = 5/7

140 x (5/7) = 100

2) 37/(5/7) = 51.8

3/4)

5) y = x^3k

96 = 64k so k= 1.5

y = 5.5^3 x 1.5 = 249.5625

6)

h = k/ r^2 - substitute the values of h and r to find k:

k = h(r^2) - and now use this to solve for h using values

7) q = k/sqrt(w) so k = 8.68(1.4) = 12.152

12.152/sqrt(4.41) = 5.786...

8)

q = k/sqrt(w) and k= 12.152

q = 12.152/sqrt(w) so w = (12.152/q)^2 and now substitute in your value of q for w

Let me know if you think i’m wrong - i’m human too!

**dxnixl**)1) b = ka

5 = 7k so k = 5/7

140 x (5/7) = 100

**correct**2) 37/(5/7) = 51.8

**correct**3/4)

**correct**5) y = x^3k

96 = 64k so k= 1.5

y = 5.5^3 x 1.5 = 249.5625

**correct**6)

**incorrect - here’s some support:**h = k/ r^2 - substitute the values of h and r to find k:

k = h(r^2) - and now use this to solve for h using values

7) q = k/sqrt(w) so k = 8.68(1.4) = 12.152

12.152/sqrt(4.41) = 5.786...

**correct**8)

**incorrect - here’s some support:**q = k/sqrt(w) and k= 12.152

q = 12.152/sqrt(w) so w = (12.152/q)^2 and now substitute in your value of q for w

Let me know if you think i’m wrong - i’m human too!

My workings out are

h=k/r^2

3.4=k/25

3.4x25=k

k=85

h=85/8^2

h=85/64

h=1.328125

Do you know where my errors is?

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#6

(Original post by

I haven't done 8 yet, but I am trying to figure out (6)

My workings out are

h=k/r^2

3.4=k/25

3.4x25=k

k=85

h=85/8^2

h=85/64

h=1.328125

Do you know where my errors is?

**noodlestopshop**)I haven't done 8 yet, but I am trying to figure out (6)

My workings out are

h=k/r^2

3.4=k/25

3.4x25=k

k=85

h=85/8^2

h=85/64

h=1.328125

Do you know where my errors is?

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(Original post by

Hi sorry i mistyped this into a calculator - but 6 is right sorry well done!

**dxnixl**)Hi sorry i mistyped this into a calculator - but 6 is right sorry well done!

My workings -

q=k/sqrt(w)

3=12.152/sqrt(w)

3x12.152=sqrt(w)

36.456^2=w

w=1329.039936

Rounded to 2dp = 1329.04

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#8

(Original post by

Thankyou! and now for question 8 I also don't know where I have gone wrong

My workings -

q=k/sqrt(w)

3=12.152/sqrt(w)

3x12.152=sqrt(w)

36.456^2=w

w=1329.039936

Rounded to 2dp = 1329.04

**noodlestopshop**)Thankyou! and now for question 8 I also don't know where I have gone wrong

My workings -

q=k/sqrt(w)

3=12.152/sqrt(w)

3x12.152=sqrt(w)

36.456^2=w

w=1329.039936

Rounded to 2dp = 1329.04

**From your working- 3x12.152=sqrt(w)**

You are not multiplying you are dividing

(12.152)/3 =sqrt(w)

Last edited by emma963; 1 month ago

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(Original post by

You are not multiplying you are dividing

(12.152)/3 =sqrt(w)

**emma963**)**3x12.152=sqrt(w)**You are not multiplying you are dividing

(12.152)/3 =sqrt(w)

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#10

(Original post by

aha, how come it is dividing instead of multiplying? I assumed that since I'm taking the 12.152 in a division to the other side I have to swap it to the opposite (Multiplication) and for my final answer I'm now getting 16.40790045 Rounded to 2dp = 16.41 Do you know if that's correct?

**noodlestopshop**)aha, how come it is dividing instead of multiplying? I assumed that since I'm taking the 12.152 in a division to the other side I have to swap it to the opposite (Multiplication) and for my final answer I'm now getting 16.40790045 Rounded to 2dp = 16.41 Do you know if that's correct?

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#11

**noodlestopshop**)

aha, how come it is dividing instead of multiplying? I assumed that since I'm taking the 12.152 in a division to the other side I have to swap it to the opposite (Multiplication) and for my final answer I'm now getting 16.40790045 Rounded to 2dp = 16.41 Do you know if that's correct?

q=k/sqrtw

You would have to multiply by sqrt(w) to get

(q)sqrt(w) = k

You have to divide to get to sqrt(w)

sqrt(w) =k/q

Last edited by emma963; 1 month ago

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(Original post by

Now it’s right - well done

**dxnixl**)Now it’s right - well done

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(Original post by

From the original equation

q=k/sqrtw

You would have to multiply by sqrt(w) to get

(q)sqrt(w) = k

You have to divide to get to sqrt(w)

sqrt(w) =k/q

**emma963**)From the original equation

q=k/sqrtw

You would have to multiply by sqrt(w) to get

(q)sqrt(w) = k

You have to divide to get to sqrt(w)

sqrt(w) =k/q

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