Question

A was born 5 yrs before B, B is 4 yrs older than C and 3 yrs younger to D. If A is now 17 yrs old, how old is D?
1) 19 yrs
2) 15 yrs
3) 12 yrs
4) 8 yrs
explanation ??

Answer 1

$\textbf {Hey there, here is the solution.}$

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STEP 1: Express their age in term of x:

Let the age of B be x

B = x

.

A is born 5 years before B:

A = x + 5

.

B is 4 years older than C:

C = x - 4

.

B is 3 years younger than D:

D = x + 3

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STEP 2: Find x:

Given that A is 17 years old

⇒ x + 5 = 17

⇒ x = 12

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STEP 3 Find D's age:

D = x + 3

D = 12 + 3

D = 15 years old

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Answer: (2) D is 15 years old.

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⭐$\textbf {Cheers}$⭐