In one year, a school uses 13,170 pieces of white paper, 6,570 fewer pieces of blue paper than white paper, and 3,300 fewer pieces of yellow paper than blue paper. How many pieces of paper does the school use in all? Solve on paper.

The school uses pieces of paper.

23,070

Step-by-step explanation:

13,170-6570=6600

6600-3300=3300

13,170+6600+3300=23,070

The school uses 23,070 pieces of paper

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.