Steve has a dog that weighs 5 times as much as Ian's dog. The total weight of both dogs is 72 pounds. How much does Steve's dog weigh?

S=steve's dog's weight

i=ian's dog's weight

so steve's dog weighs 5 times of ians dog

s=5 times i

s=5i

total weight=72

s+i=72

we can subsitute 5i for s since s=5i

5i+i=72

add

6i=72

divide by 6

i=12

find s

s+i=72

s+12=72

subtract 12

s=60

weighs 60 pounds