The ratio of circumradius and hypotenuse a right-angled triangle is

The greatest four digit number which is exactly divisible by each one of the numbers 12, 18, 21 and 28.

In a circle with centre O, AB is the diameter. P and Q are two points on the circle on the same side of the diameter AB. AQ and BP intersect at C. If ∠POQ = 54°, then the measure of ∠PCA is:

What is the area ( in cm² ) of the circumcircle of a triangle whose sides are 6 cm , 8 cm and 10 cm respectively ? 

A student multiplies a number by 5/3 instead of 3/5. What is the percentage error in the calculation?

A train covers 400 m distance in 24 sec. Its speed is-

If there is an increase of 25% in edible oils, by what percent should a housewife reduce her consumption of oil so that the expenditure on this item does not increase?

Rahul invested equal sums of money at compound interest under two schemes A and B. Under scheme A, the interest rate was 10% per annum and under scheme B, the interest rate was 12% p.a. The compound interest after two years on the sum invested in scheme A was ₹1,050. How much is the interest earned under scheme B after two years, if the interest is compounded annually in both schemes?