The weight of jacobs backpack is made of the weight of the contents of the backpack as well as the weight of backpack itself. seventy percent of the total weight is textbooks. his notebooks weight a total of 4 pounds, and the backpack itself weighs 2 pounds. if the backpack contains only textbooks and notebooks, which equation can be used to determine t. the weight of the textbooks?

It looks like there are choices. If I don't get this the way your choices are written please leave a note under my answer.

total weight = w

w = n + bp + t

t = 70% * w <<<< One possible answer

t = (70/100)*W = 0.7*W Either one of these could be an answer.

n = 4 pounds

bp = 2 pounds

w = 4 + 2 + t Substitute for t

W = 6 + (70%W)

W = 6 + (70/100) * W

W = 6 + 0.7*W Subtract 0.7W from both sides.

W - 0.7W = 6

0.3W = 6 Divide by 0.3

W = 6/0.3

W = 20

t = (70/100*20 = 14 <<<< Could be an answer.

Please put the possible choices up soon. The mods can be very touchy about uncertain answers. They are correct to delete such questions.