Question 161982
X=lbs of hamburger that costs$1.60
70=lbs of hamburger that costs $2.10

Even thought the cost varies the total quantity of meat is constant.

1.60x+(2.10)(70)=1.70(x+70)

1.60x+147=1.70x+119

Subtract 1.60x from both sides 

subtract 119 from both sides
28=.1x

divide both sides by .1

280=x


Let's doublecheck our answer by replacing the x with 280

1.6(280)+147=(350)1.7

448+147=595

595=595