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ahrayia [7]
3 years ago
9

My mum was 27 when I was born. 8 years ago she was twice as old as I shall be in 5 years time. How old am I now?

Mathematics
1 answer:
allochka39001 [22]3 years ago
4 0
Use timeline and work from NOW
me. mom
(1) @born 0. 27
My mum was 27 when I was born.
(2) now-8. x-8. y-8
(3) now. x y
(4) now+5. x+5. y+5

(1)&(3). y-x = 27-0 = 27

8 years ago she was twice as old as I shall be in 5 years time.
(2)&(4). y-8 = 2(x+5)

2 variables 2 equations ... solve x
x = 9, y = 36
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6 0
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5 0
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15. Solve: 21-3y=36-6y<br> A) 19<br> B) 5<br> C) -5/3<br> D) -19
juin [17]
<span>21-3y=36-6y        +3y
21 = 36 - 3y          -36
-36+21 = -3y
- 15 = - 3y              ÷ -3
5 = y

Choice: B


</span>
6 0
3 years ago
Read 2 more answers
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