Let number of ₹ 5 and ₹ 10 coins are x and y respectively. then from question, x + y = 25 ....(i) and 5x + 10y = 160 x + 2y = 32 ....(ii) from (i) and (ii), we have. 2y – y = 32 – 25 y = 7 Now, x + y = 25 x + 7 = 25 ⇒ x = 25 – 7 = 18 Hence, number of ₹ 5 and ₹ 10 coins are 18 and 7 respectively.