mistakess
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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.
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gtty123
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Use it as 'x' and try and form an equation ie jay=x and work from there
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mistakess
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(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.
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Zahra_2001
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(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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Anonymouspsych
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(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.
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Shukokai
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Jay = J
Kiara = K
Martha = M
K = J+7
M = 2K= 2(J +7) = 2J +14
JM
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: 14:21:42
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mistakess
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(Original post by Shukokai)
Jay = J
Kiara = K
Martha = M
K = J+7
M = 2K= 2(J +7) = 2J +14
JM
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: 14:21:42
Thank youuu!
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mistakess
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(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
14:21:42
simplified down to 7:3:6
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Zahra_2001
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(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
14:21:42
simplified down to 7:3:6
ohhh thx btw is this question for the higher tier
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mistakess
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(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.
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Shukokai
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(Original post by mistakess)
Yeah, it was in my higher mock. Only question 2 though.
How many marks?
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Zahra_2001
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(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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mistakess
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(Original post by Shukokai)
How many marks?
It was 4 marks
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year 11 revise
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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
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gtty123
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(Original post by mistakess)
Thank you so much, I feel stupid, that was really simple.
It's okay dude trust me if you see a question similar to that use the algebraic method in order to obtain the answer.
Last edited by gtty123; 5 months ago
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bvmh
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4 marks
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tijen
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Please do step my step in details because i'm confused
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tijen
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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 >: (
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myye
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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 >: (
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x.Chidimma.x
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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 JM as 7:3:6
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