Level 3
A rectangular tank measuring 60 cm by 50 cm by 25 cm was to be filled with water by two taps, A and B. Tap A which fills the tank at a rate of 8ℓ per minute was first turned on for 5 minutes before Tap B was turned on as well. If the tank was filled to the brim in a total of 7 minutes from the time when Tap A was first turned on, what is the rate at which Tap B fills the tank? Give the answer in ℓ per minute correct to 1 decimal place.

Level 3
Tank A, measuring 40 cm by 30 cm by 50 cm, was filled with water to the brim. Water was then poured from Tank A to Tank B, which has a base area of 900 cm² until the height of the water level in Tank B became twice that of the water level in Tank A. Find the volume of water in Tank B, leaving the answer in litres.

Level 1
Round off 88 to the nearest ten. Then estimate 88 x 9.

Level 2
Mrs Tan had 10 ℓ of orange juice. She used ¹₂ of the orange juice for a picnic and ²₅ of the remaining orange juice to bake orange-flavoured cookies. How much orange juice did she have left? Give your answer in litres.