A particular shade of green is formed by mixing 30% of yellow paint to 70 % blue paint by volume. How many gallons of yellow paint should be added to 70 gallons of this green paint to reduce the percentage of blue paint by 10 %.
a) 7
b) 23/3
c) 10
d) 32/3
e) 35/3
E
E for me…
its E…
can somebody kindly explain how u got the answer,i have no clue how to start!?
Take GMAT Team, help me with this question
Yellow paint=30% of 70 = 21 gallon
Blue paint = 70% of 70 = 49 gallon
suppose y gallon of yellow paint needs to be added to make the blue paint decrease by 10%.
so, 49 = 60%(70+y)
y = 35/3. Thats the ans.
E……….For Blue Paint allegation is,
70…..0
\ /
\ /
60
/ \
/ \
60 10
but the original solution is 70 gallons so the new solution is 35/3……
Another approach is what @Ani has suggested.
E