A container measuring 25 cm by 20 cm by 54 cm was
13 filled with water at first. Riordan poured some water into the container. In the end, the height of the water level in the container was 23 cm as shown.
- How much water did Riordan pour into container? Give your answer in mℓ.
- Riordan then poured all the water in the container into several identical flasks. Given that each flask can hold at least 1.7 ℓ of water, what is the least number of flasks he would need?
(a)
Height of water in the container at first
=
13 x 54
= 18 cm
Increase in the height of water in the container
= 23 - 18
= 5 cm
Volume of water poured into the container
= 25 x 20 x 5
= 2500 mℓ
(b)
Volume of the water after some water was poured in
= 25 x 20 x 23
= 11500 cm
3
1.7 ℓ = 1700 mℓ
Number of flasks
= 11500 ÷ 1700
= 6 r 1300
Least number of flasks that he would need
= 6 + 1
= 7
Answer(s): (a) 2500 mℓ; (b) 7