If a+b=7 and √b²-9 =4. Find 'a'?

The master bedroom of area 256 sq.ft.of a new building has been completely paved with 16 vitrified square tiles. What is the length of the tile used?

When a number 'x' is divided by '4' we get the cube of another number, 'y'. Find 'x' if y³<10

If the diameter of a circle is doubled, its area is increased by ………… times.

Which is the next in the series?

3,13,31,57, ……

If A=B/2; B=C²/2; c=2√3. Which is A of the following?