Jay weights 20 pounds more than Dan whose weight is twice that of Kirsten's is. Their total weight is 320 pounds. How much does Kirsten weight. I need this in an equation.

Question

I am having trouble understanding how to put it an a equation.

Answer 1

j = d + 20

d = 2k, k = d/2

j + d + k = 320

Substitute:

d + 20 + d + d/2 = 320

2d + 40 + 2d + d = 640

5d = 600

d = 120

j = 140

k = 60