# Maths questionWatch

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Thread starter 11 months ago
#1
I really need help with this question:

Kiara is 7 years older than Jay.
Martha is twice as old as Kiara.
The sum of their three ages is 77.

Find the ratio of Jay's age to Kiara's age to Martha's age.
4
11 months ago
#2
Use it as 'x' and try and form an equation ie jay=x and work from there
0
Thread starter 11 months ago
#3
(Original post by gtty123)
Use it as 'x' and try and form an equation ie jay=x and work from there
Thank you so much, I feel stupid, that was really simple. 0
11 months ago
#4
(Original post by gtty123)
Use it as 'x' and try and form an equation ie jay=x and work from there
ummm got interested in this question but still don't get it lol
So is kiara gonna be x+7
jay will be x
Martha 2(x+7)
Idk I'm confused
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0
11 months ago
#5
(Original post by Zahra_2001)
ummm got interested in this question but still don't get it lol
So is kiara gonna be x+7
jay will be x
Martha 2(x+7)
Idk I'm confused
let K,J & M be Kiara's, Jay's and Martha's ages respectively.

K = J + 7
M = 2K
M + K + J =77

Play around with these equations and see where you get.
0
11 months ago
#6
Jay = J
Kiara = K
Martha = M
K = J+7
M = 2K= 2(J +7) = 2J +14
J M
J:J +7:2J +14
J+J+7+2J+14= 4J + 14
4J +14= 77
4J = 56
J = 14
K) 14 +7 = 21
M) 2x14 14 = 42
14 +21 +42 = 77
Answer: 14 42
1
Thread starter 11 months ago
#7
(Original post by Shukokai)
Jay = J
Kiara = K
Martha = M
K = J+7
M = 2K= 2(J +7) = 2J +14
J M
J:J +7:2J +14
J+J+7+2J+14= 4J + 14
4J +14= 77
4J = 56
J = 14
K) 14 +7 = 21
M) 2x14 14 = 42
14 +21 +42 = 77
Answer: 14 42
Thank youuu!
0
Thread starter 11 months ago
#8
(Original post by Zahra_2001)
ummm got interested in this question but still don't get it lol
So is kiara gonna be x+7
jay will be x
Martha 2(x+7)
Idk I'm confused
Yeah and then it would be x+x+7+2x+14
simplify to 4x+21=77
then solve that so x=14

So Jay is 14, Kiara is 21 and Martha is 42
14 42
simplified down to 7 6
0
11 months ago
#9
(Original post by mistakess)
Yeah and then it would be x+x+7+2x+14
simplify to 4x+21=77
then solve that so x=14

So Jay is 14, Kiara is 21 and Martha is 42
14 42
simplified down to 7 6
ohhh thx btw is this question for the higher tier
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0
Thread starter 11 months ago
#10
(Original post by Zahra_2001)
ohhh thx btw is this question for the higher tier
Yeah, it was in my higher mock. Only question 2 though.
0
11 months ago
#11
(Original post by mistakess)
Yeah, it was in my higher mock. Only question 2 though.
How many marks?
0
11 months ago
#12
(Original post by mistakess)
Yeah, it was in my higher mock. Only question 2 though.
glad I'm doing foundation then lol last yr I was doing higher and i dreaded maths now I love it cuz it's much easier
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0
Thread starter 11 months ago
#13
(Original post by Shukokai)
How many marks?
It was 4 marks
0
11 months ago
#14
Make an equation for each of their ages:
J=X
K=7+X
M=7+X x7+X
Add up how many you have then put into a simultaneous equation
If you need any more help let me know
0
11 months ago
#15
(Original post by mistakess)
Thank you so much, I feel stupid, that was really simple. Its okay dude trust me if you see a question similar to that use the algebraic method in order to obtain the answer
0
5 months ago
#16
4 marks
0
4 months ago
#17
Please do step my step in details because i'm confused
0
4 months ago
#18
Can someone please explain how they got the answer in more detail because i'm really confused !! Im doing higher and i cant even do the second question on the paper >: (
0
4 months ago
#19
Can someone please explain how they got the answer in more detail because i'm really confused !! Im doing higher and i cant even do the second question on the paper >: (
0
2 weeks ago
#20
My exact mood when i opened this paper lol, but dont worry i got you.

so the question says that Kiaria (K) is 7 years older than Jay. So by this we automatically can put this as an expression = 7 + X.
X being Jay's age.
It says that Martha is twice as old as Kiaria so that means itll be 2x(7+X), 2x of K's age. And we can just represent Jay's age as X
so we have
Kiaria= 7 + X
Martha= 2(7+X)
Jay= X

Now put all these terms into an equation to find X
so

7+X+2(7+X)+X=77 (Question says that all their ages add up to 77)

Collecting like terms and simplifiying this gives us
21+4X=77
reaarrange to make X on its own
X = 14

substitute 14 into these equations in place of X
Kiaria= 7 + X
Martha= 2(7+X)
Jay= X

K=21
M=42
J=14

You can simplify it to get J M as 7 6
0
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