(1) The product of Ria's age (in years) 3 years ago with her age (in years) 5 years later is 240. Find her current age. (2) Ashish buys number of cookies for Rs 40. If he had bought 2 more cookies for the same amount, each cookie would have cost Rs.1 less. How many cookies did he buy? (3) A piece of copper wire costs Rs.240. If it was 4 meter longer and price of each meter of copper wire costs Rs.3 less, the total cost of the piece would remain unchanged. Find the length of copper wire. (4) The sum of the n consecutive natural odd numbers starting from 3 is 48. Find the value of n. (5) Find solution of quadratic equation 6y²-13y - 5 = 0 (6) The sum of square of two positive numbers is 832. If square of the larger number is 36 times the smaller number, find the numbers. (7) If the price of a sweet is reduced by Rs.4, Gita can buy 8 more sweets for Rs.192. Find the original price of sweet. (8) Solve quadratic equation x² + 5x- (a² + 3a-4)= 0 using factorization.