DETERMINE THE AGE.....

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20 Years ago when Sandy's parents got married their average age was 18 years.Now the average age of her family consisting of herself and her parents only is 45.Then what is her present age?

The answer is 59.

1 solution

Sean Elliott
Jan 24, 2014

Let Sandy's parents current ages be $P_1$ and $P_2$ , and let Sandy's age be $S$ .

From the initial information, we have that $\frac{(P_1-20)+(P_2-20)}{2}=18$ , which implies that $P_1+P_2=2(18)+20+20=76$ .

Also, $\frac{P_1+P_2+S}{3}=45$ . Plugging in the information above gives $\frac{76+S}{3}=45$ , or $S=3(45)-76=\boxed{59}$ .

Sounds like she's a bit old ;)

But this implies that her age at the time of her parents marriage was 39 years. The parents' average age was itself 18 years, then how can she be 39 years old????

Shabarish Ch - 7 years, 2 months ago

Step parents maybe

Eric Brian Anil - 6 years, 8 months ago

DETERMINE THE AGE.....

The answer is 59.

1 solution

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