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Solution
Volume of water in container X - 40 x 30 x 20
= 24000 cubic centimetres
Volume of water in container Y - 20 x 20 x 42
= 16800 cubic centimetres
New volume of water in container Y - 24000 + 16800
= 40800 cubic centimetres

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Method 1
4725
———      = 3cm
45x35

18cm + 3cm = 21cm

Method 2

45cm x 35cm x 18cm = 28350cm3

28350cm3 + 4725cm3 = 33075cm3

33075
________ = 21cm
45 x 35

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Question 7 solution
Volume of water at first - 18 x 45 x 35
= 28350 cubic centimetres
Volume of water after adding - 28350 + 4725
= 33075 cubic centimetres
New height of water - 33075 divided by (35 x 45)
= 21 cm. (Final answer)

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Group Acorn

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Group 3 Rui Yue, ao yutong,Aiman,Feng rui 

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Group 3 Rui Yue, ao yutong,Aiman,Feng rui 

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Pg47 question 8

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Volume of 1/2 the tank = 4800 x 15
= 7200ml
= 72 L

Time taken to empty     = 72 L /18 L
the tank
= 4 minutes

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Q8 ans: 79.5cm

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