If a : b = 20:5 then find out the value of (13a-9b): (11a-7b)?

Direction : Given here is a multiple bar diagram of the scores of four players in two innings. Study the diagram and answer the questions.

The total scores in the first innings contributed by the four players is :

Mohit borrowed Rs. 22000 at 5% simple interest repayable in 5 equal installments. What will be the annual installment payable by him?

How many three-digit numbers are there in which all the digits are odd? 

The smallest possible three - place decimal is: 

The radius of a semicircle is 35 cm, find its area and perimeter.

A bag contains Rs.90 in coins of denominations of 50 paise, 25 paise and 10 paise. If coins of 50 paise, 25 paise and 10 paise are in ratio 2 : 3 : 5, then the number of 25 paise coins in the bag is 

Solve for x if $$ {x^{a^{3}}}.x^{b^{3}}.x^{3ab(a+b)}=(2^{5})^{25},a+b=5 $$