3 years ago

Jack is 2 times as old as Lacy. 7 years from now the sum of their ages will be 35 . How old are they now?

1 answer:

8 0

Assume the old of Jack is X and the old of Lacy is Y
so ...
do the mathematical model ...
.
X=2Y
(X+7)+(Y+7)= 35
-
THEN
Solve the equation
y= 7
x = 14

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