The Correct answer is (D)

Explanation:

Let the age of son = X years

∴Age of mother would be =2X

As per question 20 years ago;

10 (X -20) = 2X – 20

10X – 200 = 2X – 20

10X – 2X= – 20 + 200

8X = 180

X== 22.5 years

∴Age of mother = 22.5 * 2 = 45 years

The Correct answer is (A)

Explanation:

Let age of son 4 years ago be = X

So, age of man 4 years ago would be = 6X

As per question after 16 years;

2* age of son = age of man

2(X + 4 +16) = (6X + 4 + 16)

2X +40 = 6X + 20

2X – 6X = 20 – 40

– 4X = – 20

X = 5 years

∴Present age of son = 5 + 4= 9 years

Present age of man = 6X + 4= 6*5 + 4 = 30 +4 = 34 years

Solution 2:

Apply formula; A’s (man) present age+ t1

= = 9 years

The Correct answer is (B)

Explanation:

Let the age of Minu is 4X and age of Meera 2X.

As per question; 4X + 2X = 6

6X = 6

X = 1

∴Minu’s age = 4*1= 4 years

Meera’s age = 2*1= 2 years

Ratio of their ages after 8 years;

= (4+8): (2+8)

= 12: 10

= 6:5

The Correct answer is (C)

Explanation:

Let the age of Seeta is 2X and age of Geeta 7X.

As per question after 6 years;

4X +12 = 7X + 6

-3X = -6

X = 2

∴Age of Seeta = 2 * 2 = 4 years

Age of Geeta = 7 * 2 = 14 years

Difference in their ages = 14 – 4 = 10 years

The Correct answer is (A)

Explanation:

Let the present age of the father is 7X and present age of son is 2X.

As per question, ten years ago;

(7X – 10)+ (2X – 10) = 34

7X – 10 + 2X – 10= 34

9X = 34 + 20

9X = 54

X = 6

∴Present age of son = 2 * 6= 12 years