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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 7 - Mathematics
9.50 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:

  1. 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.
10 metres
20 metres
6 metres
11 metres

Q 2: The length and width of a water tank are 14 metres and 8 metres respectively. Find the height if the cost of plastering the outer walls of the tank at the rate of $ 6.5 per square metre is given by $2002.
8 metres
6 metres
7 metres
14 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.
$ 2
$ 7
$ 4
$ 3

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
$ 4184
$ 5284
$ 5184

Question 5: This question is available to subscribers only!

Question 6: This question is available to subscribers only!


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