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Jerry is presently twice as old as his brother and six years older than his sister. How many years from now will Jerry’s age be 2/3 of the combined ages of his brother and sister at that time?

 Nov 4, 2019
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Jerry's age = x

Brother's age = 1/2x

Sister's age = x -6

 

y = number of years

 

x+y = 2/3 (1/2x +y  +  x-6 +y)

x+y = x + 4/3 y -4

y = 4/3 y - 4

-1/3 y = -4

y = 12 years from now

 Nov 4, 2019

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