Question

A chemist has a bottle of a 10% acid solution and a bottle of a 30% acid solution. He mixes the solutions together to get 500 mL of a 25% acid solution. How much of the 30% solution did he use?

A. 125 mL
B. 150 mL
C. 375 mL
D. 450 mL
PLZ HELP IM TIMEDD

Answer 1

C

Explanation:

m+x=500

0.3m+0.1(x)=500*0.25

x=500-m

0.3m+(0.1(500-m))=0.25*500

0.3m-0.1m+50=125

0.2m+50=125

0.2m=75

m=75*5

m=375

C