Question: 16 -

The cost of the paint is Rs. 36.50 per kg. If 1 kg of paint covers 16 square feet, how much will it cost to paint outside of a cube having 8 feet each side

860

886

850

876

Answer:

876

Solution:

We will first calculate the Surface area of the cube, and then we will calculate the quantity of paint required.
Surface area = 6a²
=6*8²=384 sq feet
16 square feet is covered by 1 kg of paint.
384 square feet will be covered by = = 24kg of paint

As per the question, the cost of the paint is Rs. 36.50 per kg.
So, the total cost of painting =36.50*24
=Rs.876

Question: 17 -

A swimming pool 9 m wide and 12 m long is 1 m deep on the shallow side and 4 m deep on deeper side. Find the volume of the swimming pool?

272

260

270

262

Answer:

270

Solution:

Volume will be length * breadth * height,
But, in this case two heights are given so we will take average,


12*9*2.5m³=270m³

Question: 18 -

A boat of length 3 m and breadth 2 m is floating on a lake. The boat sinks by 1 cm when a man gets into it. What is the mass of the man?

80

60

50

70

Answer:

60

Solution:

In this type of question, first, we will calculate the volume of water displaces then we will multiply it with the density of water.
1 cm = 0.06 m
Volume of water displaced = 3*2*0.01 = 0.06 m cube
Mass of Man = Volume of water displaced * Density of water (around 1000 kg/m³)
                         = 0.06 * 1000 = 60 kg

Question: 19 -

How many bricks, each measuring 25cm*11.25cm*6cm, will be needed to build a wall 8m*6m*22.5m?

620000

64000

630000

610000

Answer:

64000

Solution:

To solve this type of question, simply divide the volume of the wall with the volume of brick to get the required number of bricks.
Number of bricks:
== 640000