Harold took 5 hours to paint 3 same-sized walls. If he works at the same rate, how long will it take him to paint 18 walls of the same size?

30 hours

Step-by-step explanation:

We can use ratios to solve

5 hours        x hours

=

3 walls          18 walls

Using cross products

5*18 = 3x

Divide each side by 3

5*18/3 = 3x/3

30 =x

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