Arithmetic Aptitude Problems on Ages

• A 15, 25
• B 16, 40
• C 16, 48
• D 15, 30
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B

Answer: B

Son's age 8 years ago: x years
Rohit's age 8 years ago: y years
Son's age after 8 years: z years
Rohit's age after 8 years: w years

Equations:

y = 4x
z = x + 16
w = 4x + 16
2z = w
Substituting the expression for z and w:

2(x + 16) = 4x + 16
2x + 32 = 4x + 16
2x = 16
x = 8
Substituting this value for x into the expressions for the son's and Rohit's ages:
Son's present age: x + 8 = 8 + 8 = 16 years
Rohit's present age: 4x + 8 = 4 * 8 + 8 = 40 years

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