Question

Lian's dog eats

1/20
of a bag of dog food each week. Lian currently has 5/8 of a bag remaining.

How many weeks will it take Lian's dog to finish this remaining food?

Answer 1

12.5

Explanation:

Just did it on Khan academy.

Answer 2

Explanation:

it eats 1/20 of a bag each week

so, the ratio is 1/20 / 1

now we have 5/8 of a bag to be eaten in x weeks. and that has to have the same ratio.

so,

5/8 / x = 1/20 / 1 = 1/20

5/8 = x/20

20×5/8 = x

100/8 = x

25/2 = x

x = 12.5 weeks

the dog will finish this in 12.5 weeks.