Page 119 - NUMINO Challenge_D2
P. 119
Type 13 -2 Filling the Bathtub
A 20-L bathtub needs to be filled with water by turning on faucet A,
which pours 90 mL of water in 2 seconds, and faucet B, which pours
190 mL of water in 5 seconds. However, there is a hole at the bottom of
the bathtub that drains away 9 mL of water in 3 seconds. How many
seconds will it take to fill the bathtub with water?
AB
1 Find the amount of water poured from each faucet every second.
2 What is the amount of water that leaks out of the bathtub every second?
3 Find the amount of water added to the bathtub in one second by using
the amount of water poured from faucets A and B, and the amount of
water drained through the hole in one second.
4 Find the amount of time it takes to fill a 20-L bathtub with water.
116 NUMINO Challenge D2
A 20-L bathtub needs to be filled with water by turning on faucet A,
which pours 90 mL of water in 2 seconds, and faucet B, which pours
190 mL of water in 5 seconds. However, there is a hole at the bottom of
the bathtub that drains away 9 mL of water in 3 seconds. How many
seconds will it take to fill the bathtub with water?
AB
1 Find the amount of water poured from each faucet every second.
2 What is the amount of water that leaks out of the bathtub every second?
3 Find the amount of water added to the bathtub in one second by using
the amount of water poured from faucets A and B, and the amount of
water drained through the hole in one second.
4 Find the amount of time it takes to fill a 20-L bathtub with water.
116 NUMINO Challenge D2
