On increasing the radius of circle by 1 cm, its area is increased by 44 cm² .The original radius of the circle is -

The sides of a triangle are in the ratio 2 : 3 : 4. The perimeter of the triangle is 18 cm. The area (in cm²) of the triangle is

A and B start at the same time with speeds of 40 km/hr and 50 km/hr respectively. If in covering the journey A takes 15 minutes longer than B, the total distance of the journey is

If 7A = 5B = 2C; find A : B : C.

A sum invested at a certain rate of interest per annum, compounded annually, amounts to ₹3,600 in 2 years and to ₹6,480 in 4 years. What is the sum invested?

What should come in place of the question mark '?' in the following number series?

0.25, 1.25, 4.5, ?, 70, 355

The average of six numbers is 3.52. The average of two of them is 3.7, while the average of other two is 2.5. What is the average of the remaining two?

One-third of 1206 is what percentage of 134?