Question

Marcus painted one-third of his bedroom in fourth-fifths of an hour. At this rate, how long would it take him to paint the entire room? (5 points)

a
five-twelfths of an hour

b
twelve-fifths of an hour

c
fifteen-fourths of an hour

d
four-fifteenths of an hour

Answer 1

Answer:

b 12/5ths of an hour

Step-by-step explanation:

1/3-4/5

2/3-?

crossmultiply

2/3 x 4/5      = 2/3 x 4/5 x 3

  1/3                 8/5

2/3 - 8/5

3/3 - ?

crossmultiply

3/3 x 8/5 x 3/2 = 12/5