Multiple Choice QuestionsA and B together can complete a piece of work in 12 days. B and C can do it in 20 days and C and A can do it in 15 days. A, B and C together it in
6 days
8 days
10 days
12 days
C.
10 days
Shortcut Method:
Let A, B and C together can complete a piece of work in x days.
Now, 
A and B can complete a work in 3 days. They start together but, after 2 days, B left the work. If the work is completed after 2 more days, B alone could do the work in
4 days
6 days
8 days
10 days
A does 20% less work than B. If A can complete a piece of work in 
then B can do it in
4h
6h
8h
10h
The diameters of two circles are the side of a square and the diagonal of the square. The ratio of the areas of the smaller circle and the larger circle is
1 : 4
1 : 2
The total surface area of a sphere is 
square unit. The volume of the sphere is
cu unit.
A conical flask is full of water. The flask has base radius r and height h. This water is poured into a cylindrical flask of base radius mr. The height of water in the cylindrical flask is
A dozen pairs of socks quoted at ₹ 180 are available at discount of 20%. How many pairs of socks can be bought for ₹ 48?
4 pairs
2 pairs
5 pairs
3 pairs
The marked price of a table is ₹ 12000. If it was sold for ₹10500 after allowing a certain discount, then the rate of discount is
10%
12.5%
15%
17.5%
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