Question

Quantity I: The ratio of the ages of A and B is 3:1, and the ratio of the ages of B to C is 3:5. If C’s age after 20 years equals A’s current age, and D’s age is 80% more than B’s age, what is the average age of A and D? Quantity II: A is 12 years older than B, and B is 10 years younger than
C. The average age of A, B, C, and D is 30 years. If C’s age equals D’s age, find D’s age after 4 years.

Q: Answer-Quantity I: The ratio of the ages of A and B is 3:1, and the ratio of the ages of B to C is 3:5. If...

From quantity I, Ratio of the ages of A, B and C 935 5x 20 9x 4x 20 x 5 years Ds age 3 5 180100 27 years Average ages of A and D 27 452 36 years From quantity II, A B 12 C B 10 B C 10 A 12 C 10 C 2 C D A B C D 30 4 120 C 2 C 10 C C 120 4C 128 C 32 D D 4 36 Quantity I Quantity II