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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?​


Sagot :

A.)

[tex] \frac{25}{7}[/tex]

B.) 2

D.) 45

SOLUTION:

a.)

[tex]15 \div 5 = 5 \\ 5 \div \frac{5}{7} = \frac{25}{7} [/tex]

b.)

[tex]2 \times 15 = 30 \\ 105 \div 30 = 3.5 \\ 7 \div 3.5 = 2[/tex]

c.)

[tex]75 \div 5 = 15 \\ 3 \times 5 = 15 \\ 21 \div 7 = 3 \\ 15 \times 3 = 45[/tex]