Question

Tommy mixed ‡ gallon of

yellow paint with 1; gallons
of blue to make green paint
for his treehouse. He ran out
of green and needs to make
more. If he uses 2 gallons of
blue paint, to keep the same
ratio, how much yellow paint
should Tommy use?Tommy mixed à gallon of
yellow paint with 1; gallons
of blue to make green paint
for his treehouse. He ran out
of green and needs to make
more. If he uses 2 gallons of
blue paint, to keep the same
ratio, how much yellow paint
should Tommy use?

Answer 1

2/3 gallon

Explanation:

If y is the amount Tommy should use, and he want to keep the same proportion, then the proportion is ...

y/(2 gal) = (1/2 gal)/(3/2 gal) = yellow/blue

y = (2 gal)(1/3) = 2/3 gal

Tommy should use 2/3 gallon of yellow paint.