61. The product of two decimals is 14.837. If one of them is 4.01, what is the other decimal? (a) 7.3 (b) 3.07 (c) 3.7 (d) none of these. 62. If 15.5 litres of oil cost Rs. 2126.60, what is the cost of 1 litre of oil? (b) Rs. 173.2 (d) both a and c. (a) Rs. 137.2 (c) Rs. 137.20 63. If the cost of 8 pen is Rs. 234.40, find the cost of 1 pen. (a) Rs. 39.20 (b) Rs. 29.30 (c) Rs. 23.90 (d) none of these. 64. If 25 tin of ghee weigh 412.5 kg, find the weight of 1 tin. (a) 15.6 kg (b) 16.05 kg (c) 15.5 kg (d)none of these 65. How many pieces of plywood, each 0.35 cm thick, are required to make a pile 1.89 m high? (a) 504 pieces (c) 540 pieces (b) 450 pieces (d) none of these​