AFCAT Model Paper 7

Given:
The ratio between the present age of father and mother is 10 ∶ 9
The ratio between the present age of the father and his son is 5 ∶ 2
Concept:
Ratio and proportion
Calculation:
Let be assume the age of the father and his son is 5x and 2x respectively.
Difference of age of father and his son 4 year ago = (5x - 4) - (2x - 4) = 30, x = 10
Present age of father = 5 × 10 = 50 year, Present age of his son = 2 × 10 = 20 years
The present age of mother =9×(

50

10

)=45 years
Sum of there age = 50 + 45 + 20 = 115
∴ The required result will be 115.