Question

A is 20 years older than B. 5 years ago A was 3 times as old as B. Find their present ages

Answer 1

A is 20 years older than B. 5years ago,a was 3 times as old as b. 
find their present ages.

Equations:
a = b + 20
a-5 = 3(b-5)

Substitute for "a" and solve for "b":
b+20-5 = 3(b-5)

b+15 = 3b-15
2b = 30
b = 15 yrs (B's age now)

Solve for "a" using a = b + 20
a = 15+20
a = 35 yrs (A's age now)

Answer 2

Answer:

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