What is david's present age if after 21 years his age will be 12 times his age 12 years back?
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let the present age of David be x years,
after 21 years his age will be (x+21) years,
age 12 years back will be (x-12) years,
According to the question,
(X+ 21) = 12 (X - 12),
X + 21 = 12X - 144
144+21 = 12X - X
11 X = 165
X = 15
∴ present age of David is 15 years
Answered by
0
Answer:
15
Step-by-step explanation:
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