7 identical pipes can fill 3 identical tanks in 45 minutes., a. How long will it take 5 pipes to fill one tank?, b. How many pipes are needed to fill 6 tanks in 105 minutes? , C. How many tanks are filled by 21 pipes in 75 minutes?

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7 identical pipes can fill 3 identical tanks in 45 minutes.


a. How long will it take 5 pipes to fill one tank?
b. How many pipes are needed to fill 6 tanks in 105 minutes?
C.​ How many tanks are filled by 21 pipes in 75 minutes?​

 

A.)

\frac{25}{7}

B.) 2

D.) 45

SOLUTION:

a.)

15 \div 5 = 5 \\ 5 \div \frac{5}{7} = \frac{25}{7}

b.)

2 \times 15 = 30 \\ 105 \div 30 = 3.5 \\ 7 \div 3.5 = 2

c.)

75 \div 5 = 15 \\ 3 \times 5 = 15 \\ 21 \div 7 = 3 \\ 15 \times 3 = 45

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