Day 183: CDS Maths

5 questions. Try each one first, then open its answer.

Question 1
Mensuration 3D. Asked once: CDS 1 2018 (same type asked 3 times) See all 3 of this type
77 $\text{m}^2$
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Question 2
Number System. Asked once: CDS 1 2017 (same type asked 3 times) See all 3 of this type
21 $The number of prime numbers which are less than 100 is$
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Question 3
Percentage, Profit and Loss. Asked once: CDS 2 2019 (same type asked 3 times) See all 3 of this type
22 $x, y and z are three numbers such that x is 30% of z and y is 40% of z. If x is p% of y, then what is the value of p ?$
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Question 4
Quadrilaterals. Asked once: CDS 1 2017 (same type asked 3 times) See all 3 of this type
86 $In a trapezium ABCD, AB is parallel to CD and the diagonals intersect each other at O. What is the ratio of OA to OC equal to ?$
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Question 5
Triangles. Asked once: CDS 2 2019 (same type asked 3 times) See all 3 of this type
77 $Three consecutive integers form the lengths of a right-angled triangle. How many sets of such three consecutive integers is/are possible ?$
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Question 1