The diagonal of a square A is (a+b). The diagonal of a square whose area is twice the area of square A, is

The adjoining diagram is frequency polygon for the scores of students in a test.
What is the total number of students appeared in the test?

Rajesh purchased two different kinds of alcohol. In the first mixture, the ratio of alcohol to water is 4 : 5 and in second mixture it is 6 : 7. If he mixes the two given mixtures and makes a third mixture of 22 litres in which the ratio of alcohol to water is 5 : 6, the quantity of first mixture that is required to make 22 litres of the third kind of mixture is.

The marked price of one pen is '₹x'. The selling price of one packet of 'x' pens, after a discount of 15%, ₹1360. What is the value of 'x'?

The sides of a triangle are in the ratio 3 : 4 : 5. The measure of the largest angle of the triangle is

If α, β are the roots of 6x²+13x+7=0, then the equation whose roots are α², β² is:

Find the exact value of cos 120⁰.

A chord of length 16 cm is drawn in a circle of radius 10 cm. The distance of the chord from the centre of the circle is