Question

A packing operator can assemble 4 cardboard boxes in 5 minutes. At this rate, how many boxes can she assemble in 25 minutes?

A. 20
B. 12
C. 24
D. 28

Answer 1

She can assemble 20 boxes.

Explanation:

1. Create a table

# of Boxes Time

4 => 5 min

x => 25 min

2. Use the table to cross multiply.

5 · x = 4 · 25

5x = 100

5x/5 = 100/5

x = 20

Answer 2

A. 20

Explanation:

look at this step:

4 : 5 = X : 25

X = 4×25/5 = 100/5 = 20