Mathematics | Maths Mcqs – 19

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Officerswiki is a free education & learning platform for all students and working professionals, where they can practice multiple-choice questions & answers (MCQs). These all MCQs on Officerswiki are FreeMcqs which are helpful in all types of exams such as PPSC, FPSC, CSS, NTS,  PMS, and UPSC. 

Three quantities X, Y and Z are such that XY=kZ where k is constant. Initially, X was at 4 and X:Y:Z was 2:3:4. If the value of Y is changed to 12 and Z is kept constant, find the value of X.

A. 2
B. 3
C. 5
D. 6

Find the mean proportion between 5 and 45.

A. 9
B. 15
C. 25
D. 50

If X:Y = 2:3, Y:Z = 4:5. Find X:Y:Z.

A. 2:3:5
B. 8:12:15
C. 2:8:5
D. 2:7:5

The ratio of two numbers a and b is 3:5. If 2 is added to both the numbers, the ratio becomes 2:3. Find b.

A. 15
B. 10
C. 8
D. 5
The plan for a rectangular area is drawn to a scale of 1:500. If the length and breadth in the plan is 30 cm and 20 cm, find the actual area.

A. 1200 m²
B. 1500 m²
C. 12000 m²
D. 15000 m²

The length and breadth of a rectangle are in the ratio 5:4. Find its perimeter if its area is 180 cm²

A. 54 cm
B. 27 cm
C. 12 cm
D. 15 cm

A can complete a work in 12 days with a working of 8 hours per day. B can complete the same work in 8 days when working 10 hours a day. If A and B work together, working 8 hours a day, the work can be completed in_______days.

A. 5 5⁄11
B. 4 5⁄11
C. 6 4⁄11
D. 6 5⁄11

A can do a particular work in 6 days . B can do the same work in 8 days. A and B signed to do it for Rs. 3200. They completed the work in 3 days with the help of C. How much is to be paid to C?

A. Rs. 380
B. Rs. 600
C. Rs. 420
D. Rs. 400

If two pipes function together, the cistern will be filled in 6 hrs.  One pipe fills the cistern 5 hrs. faster than the other.  How many hours it take the second pipe to fill the cistern?

A. 5 hrs
B. 10 hrs
C. 15 hrs
D. 20 hrs

Two pipes can fill a tank in 10 hrs. and 12 hrs. respectively while a third pipe empties the full tank in 20 hrs.  If all the three pipes operate together , in how much time the tank will be filled ? 

A. 7.5 hrs
B. 5 hrs
C. 7 hrs
D. None of these

Find the mean proportion between 5 and 45 Find the mean proportion between 5 and 45

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