Question

Practice #1 CONTRACTOR QUINN MADE A SANDY SOIL MIX FOR A LOCAL PLAYGROUND. TO MAKE THE MIX, SHE COMBINED 2 CUBIC METERS OF SOIL THAT CONTAINED 35% SAND WITH 6 CUBIC METERS OF SOVE THAT CONTAIMED 15% SAND. WHAT IS THE SAND CONTENT OF QUiNN'S NEW MIXTURE?please help somebody.

Answer 1

we know that

2 m^3 of 35% plus 6 m^3 of 15% must be equal to 8 m^3 at x%

so

2(0.35)+6(0.15)=8(x)

solve for x

0.70+0.90=8x

8x=1.60

x=0.20

Convert to percentage

x=20%