Question

A 64 pound mixture of sand and gravel is 25 percent sand. how many pounds of must be added to produce a mixture that is 40 percent gravel​,,,,
A)9.6
B)16
c)38.4
d)40
e)56

Answer 1

Answer:

Total mixture = 64 pound

Sand=25%

gravel=loo-25=75%

wt. of sand=64x25% = 16 pound

wt. of gravel=64x75%=48 Pound

Newmixture=x pound

Xx40/100 = 48

x = 4800/4o=120 pound

Sand added=120-64=56 pound

Ans(e)