A container measuring 28 cm by 21 cm by 55 cm was
15 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 20 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 pitchers. Given that each pitcher can hold at least 1.5 ℓ of water, what is the least number of pitchers he would need?
(a)
Height of water in the container at first
=
15 x 55
= 11 cm
Increase in the height of water in the container
= 20 - 11
= 9 cm
Volume of water poured into the container
= 28 x 21 x 9
= 5292 mℓ
(b)
Volume of the water after some water was poured in
= 28 x 21 x 20
= 11760 cm
3
1.5 ℓ = 1500 mℓ
Number of pitchers
= 11760 ÷ 1500
= 7 r 1260
Least number of pitchers that he would need
= 7 + 1
= 8
Answer(s): (a) 5292 mℓ; (b) 8