Question

Sam can make 15 pizzas in 2.5 hours. At this rate, how many could he make in an 8 hour work day? What is Sam´s rate per hour?

A copy machine makes 45 copies in 25 second. Find the unit rate of copied per second.

A sign in a store says 3 pens for $2.70. How much would 10 pens cost?

What is the unit price of 10 pounds of potatoes that cost $2.80?

Answer 1

1) Sam makes 48 pizzas in 8 hours. Sam makes 6 pizzas per hour.

2) The machine makes 1.8 copies per second.

3) 10 pens cost $9.00

4) $0.28

Explanation:

1)

`(15)/(2.5) =(x)/(8) \\\\2.5x=120\\x=48`

`(15)/(2.5) =(x)/(1) \\\\2.5x=15\\x=6`

2)

`(45)/(25) =(x)/(1) \\\\25x=45\\x=1.8`

3)

`(3)/(2.7) =(10)/(x) \\\\3x=27\\x=9`

4)

2.8/10 = 0.28