Rishu saves x% of her income. If her income increases by 26% and the expenditure increases by 20%, then her savings increase by 50%. What is the value of x?

Average of the test scores of a class of 'x' students is 80 and that of 'y' student is 94. When the scores of both the classes are combined, the average becomes 86. What is the ratio of x to y?

A sum of Rs. 6,000 is deposited for 3 years at 5% per annuam compound interest (compoun- ded annually). The difference of interests for 3 and 2 years will be:

One number x is thrice the other number y. If the sum of both the numbers is 20, then what is the values of x and y are respectively ?

O is the centre of this circle. Tangent drawn from a point P, touches the circle at Q. If PQ = 24 cm and OQ = 10 cm, then what is the value of OP? 

Direction: Study the following line graph carefully and answer the questions given below.
 In the below line graph, the number of animals in two zoo A and B in the years – 2001, 2003, 2005 and 2007 is given.

What is the ratio of the number of animals in zoo-A in the years 2001 and 2005 together and the number of animals in zoo-B in the years 2003 and 2007 together?

If the price of sugar is increased by 20%, then by what percent should a housewife reduce its consumption so that no expenditure on it increases?

50 grams of an alloy of gold and silver contains 80% gold by weight, how much more gold should be mixed in this metal so that the alloy contains 95% gold?