Let x = liters 20% solution to be added
then
.12(12) + .20x = .14(12+x)
.12(12) + .20x = .14(12+x)
1.44 + .20x = 1.68 + .14x
.20x = .24 + .14x
.06x = .24
x = 4 liters
Hope this helped!!
On the first on it is the first answer and the last one.
second: the second and the third one.
C, with the ten segments and moving over seven of them you will land on C.
x = 16 x sin(60) = 8sqrt(3)
answer is B.
