Beth spent 1/3 of her time she needed to complete her homework reading a chapter and the remaining 20 minutes writing an essay.How much time did she spend doing her homework?

Answer 1

(1/3)X + 20 = X where X is the number of minutes spent doing her homework

3 [ (1/3)X + 20] = 3X <--- multiplies by 3

X + 60 = 3X <--- distributive

60 = 2X

X=30

She spent 30 minutes doing homework

10 minutes reading and 20 minutes writing