A sum borrowed under compound interest doubles itself in 10 years. When will it become fourfold of itself at the same rate of interest?

A bar graph showing the height of six mountain peaks. Study the bar graph and answer the following Questions.

What is the ratio of the heights of  the highest peak and the lowest peak?

In the given figure, PQRS is square whose side is 8 cm. PQS and QPR are two quadrants. A circle is placed touching both the quadrants and the square as shown in the figure. What is the area ( in cm² ) of the circle ?

Equation of the straight line parallel to x-axis and also 3 units below x-axis is: 

Direction : What value should come in the place of question mark (?) in the following questions?

1798 ÷ 31 × ? = 348

What is the value of $${0.74×1.23×0.13\over (0.37)^{3}+(0.41)^{3}-8(0.39)^{3}}$$ ?

A right circular cylinder is formed by rolling a rectangular sheet of metal of length 44 cm and breath 20 cm along its length. The volume of cylinder is_

A solid copper sphere of radius 1.2 cm is converted into a right circular cylinder rod of length 16 cm. The ratio of total surface area of the rod to the sphere is