Study the following diagram and answer the following questions: Which numeral represents the set of persons, who play football and hockey but not cricket? 
Find the minimum number of straight lines required to make the given figure. 
Find the minimum number of straight lines required to make the given figure. 
A sum of Rs. 800 amounts to Rs. 920 in 3 years at simple interest. What would be the amount, if the interest rate is increased by 3%?
In what ratio must water be mixed with milk to gain 20% by selling the mixture at cost price?