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Ten years ago, a mother was 3 times as old as her son. 5 years ago she was 5/2 times her son's age. What is her present age?

A35 years

B30 years

C55 years

D45 years

Answer:

C. 55 years

Read Explanation:

presnt age of both son and mother is S and M respectively

10 years ago

3(S10)=(M10)3(S-10)=(M-10)

3S30=M103S-30=M-10

3SM=203S-M=20

6S2M=406S-2M=40----------------------1

5 years ago

52(S5)=(M5)\frac52(S-5)=(M-5)

5S25=2M105S-25=2M-10

5S2M=155S-2M=15-----------2

solving both 1 and 2(1-2)

S=25S=25

Mother age

=5×252M=15=5\times25-2M=15

1252M=15125-2M=15
12515=2M125-15=2M

M=110/2=55M=110/2=55


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