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MAT Exam 2021 Paper

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Question : 110 of 200

Marks: +1, -0

900 kg of mortar consists of

45 \%

sand, 144 kg of line and the rest cement. What percentage of cement is there in mortar?

27%
45%
39%
21%

Solution:

Concept:

Find the mass of cement by subtracting sand and lime from the total mass, then convert it into a percentage.

Explanation:

Total mass of mortar =

900

kg.

Sand is

45\%

of total mass.

Mass of sand

= \frac{45}{100} \times 900 = 405

kg.

Mass of lime

= 144

kg.

Mass of cement

= 900 - (405 + 144)

= 900 - 549 = 351

kg.

Percentage of cement in mortar

= \frac{351}{900} \times 100\%

= 39\%

.

Answer:

C.

39\%

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