SOLUTION: last year Groks mother weighed 3 times as much as grok. Since then grok has gained 9kg and his mother has lost 4kg. Now his mother weighs only twice as much as Grok. Find their

Question 809810: last year Groks mother weighed 3 times as much as grok. Since then grok has gained 9kg and his mother has lost 4kg. Now his mother weighs only twice as much as Grok. Find their weights
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = Grok's weight now
Let = Mother's weight now
-----------------------------
(1) kg
----------------
Last year, Mother's weight was kg
Last year, Grok's weight was kg
---------------
(2) kg
--------------------------
Substitute (1) into (2)
(2) kg
(2) kg
(2)
(2)
and, since
(1) kg
(1) kg
Mother is 62 and Grok is 31
check:
(2) kg
(2)
(2)
(2)
OK
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