Ex 12.3, 4 Cost of 5 kg of wheat is Rs 30.50. (a) What will be the cost of 8 kg of wheat? Cost of 5 kg wheat = Rs 30.50
Cost of 1 kg wheat = Rs (30.50/5)
Cost of 8 kg of wheat = Rs 30.50/5 × 8
= 30.50/5 × 8
= 30.50 × 8/5
= 3050/100 × 8/5
= 305/10 × 8/5
= 305/5 × 8/10
= 61 × 8/10
= 488/10
= 48.8
∴ It costs Rs 48.80 to buy 8 kg of wheat.
Ex 12.3, 4 Cost of 5 kg of wheat is Rs 30.50. (b) What quantity of wheat can be purchased in Rs 61?Quantity of wheat purchased in Rs 30.50 = 5 kg
Quantity of wheat purchased in Rs 1 = 5/30.50 kg
Quantity of wheat purchased in Rs 61 = 5/30.50 × 61
= 5 × 1/30.50 × 61
= 5 × 100/3050 × 61
= 5 × 10/305 × 61
= (61 × 5 × 10)/305
= (305 × 10)/305
= 10 kg
∴ 10 kg of wheat can be purchased with Rs 61

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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