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### Grade 7 - Mathematics9.50 Word Problems on Cuboid

 Example: The outer dimensions of a water tank are 6 metres, 5 metres and 4 metres. Find the cost of plastering the outer walls of the tank at the rate of \$ 10 per square metre. Solution: Given that, l = 6 metres, b = 5 metres and h = 4 metres. The lateral surface area of the tank = 2h (l+b) = 2*4 (6 + 5) = 8 * 11 = 88 square metres. The cost of plastering the walls at the rate of \$ 10 per square metres. = 88 * 10 = \$ 880. Directions: Read the above example carefully and answer the following questions: The length of a water tank is 5 more than the width and 3 less than the height. Find the cost of plastering the outer walls of the tank at the rate of \$ 6 per square metre.
 Q 1: The length and height of a water tank are 16 metres and 6 metres respectively. Find the width if the cost of plastering the outer walls of the tank at the rate of \$ 7 per square metre is given by \$3024.20 metres10 metres6 metres11 metres Q 2: The width and heigth of a water tank are 5 metres and 4 metres respectively. Find the length if the cost of plastering the outer walls of the tank at the rate of \$ 6 per square metre is given by \$480.5 metres4 metres1 metre6 metres Q 3: The outer dimensions of a water tank are 8 metres, 6 metres and 2 metres. Find the cost of plastering the outer walls of the tank per square metre if the total cost is given by is given by \$ 168.\$ 3\$ 2\$ 4\$ 7 Q 4: The outer dimensions of a water tank are 14 metres, 10 metres and 6 metres. Find the cost of plastering the outer walls of the tank at the rate of \$ 18 per square metre.\$ 4184\$ 5284\$ 5184\$ 4184 Question 5: This question is available to subscribers only! Question 6: This question is available to subscribers only!