The graph below shows the amount of water in the tank over 16 minutes.

(a) What fraction of the tank was filled 4 minutes after Tap A was turned on? Express your answer in the simplest form.

(b) In one minute, how many litres of water flowed from Tap B?

5/35 = 1/7

a) 1/7 of the tank was filled 4 minutes after Tap A was turned on.

35 - 5 = 30

10 - 4 = 6

30/6 = 5

5/4 = 1.25

5 - 1.25 = 3.75 litres

Alternative method

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10 - 4 = 6

6/4 x 5 = 7.5

35 - 5 - 7.5 = 22.5

22.5/6 = 3.75 litres

b) In one minutes, 3.75 litres of water flowed from Tap B.