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secondary 4 | E Maths

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T = 4D

Mrs. Tan is 5 times as old as her daughter Limei:

M = 5L

Sum of ages of all 4 family members:

T+M+D+L = 92

4D + 5L + D + L =92

5D + 6L = 92

4 yrs ago, Dawei was twice as old as Limei:

D-4 = 2(L-4)

D-4=2L-8

2L - D = 4

D = 2L-4

5(2L-4) + 6L = 92

10L - 20 + 6L = 92

16L = 112

L = 112/16 = 7

L = 7

D = 2L-4 = 10

Dawei is 10 yrs old and Limei is 7 yrs old now.

T=4*10 = 40

M = 5*7 = 35

D=10

L=7

T+M+D+L = 40+35+10+7 = 92

D-4 = 2(L-4)

10-4 = 2(7-4)

6=6

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