25 of a tank is filled with water. Another 90 litres of water are needed to fill the tank to its brim.
- What is the volume of the tank in mℓ?
- The height of the tank is 30 cm and its breadth is 50 cm. Find the perimeter of its base.
(a)
Fraction of the tank not filled with water = 1 -
25 =
35 35 of the tank = 90 ℓ
15 of the tank = 90 ÷ 3 = 30 ℓ
55 of the tank = 30 x 5 = 150 ℓ
150 ℓ = 150000 mℓ
(b)
Length of the tank
= 150000 ÷ (30 x 50)
= 100 cm
Perimeter of the base
= (100 + 50) x 2
= 300 cm
Answer(s): (a) 150000 mℓ; (b) 300 cm