Question 159806
Convert % in decimal format

.5%=.5/100=0.005
.75%=.75/100=.0075
.65%=.65/100=.0065

X= the higher grade of oil that has .75% of additive

1000-X= volume of grade of oil that has .5% additive

The total volume on both sides of the equation =1000L

.0075X+.005(1000-X)=.0065(1000)

Use the distributive property

.0075X+5-.005X=6.5

.0025X+5=6.5

subtract 5 from both sides

.0025X=1.5

divide both sides by .0025

X=600L of .75% additive oil

1000-600=400L of .50% additive

Plug in to check answer

600(.0075) + 400(.005)=.0065(1000)

4.5 + 2=6.5