Page 1 :
Collins, Sample Copy, Collins, If you have purchased this copy, please contact the publisher, Maths Now, Collins, Prabha Sethy

Page 2 :
+ 1 8, 4, + 1 0, 4, 6., 6., 8., 2 3, O Ot Oh Oth, O Ot O, 1, 1, 14, 2, 4, 8., + 3, 4 0 2, 6 0 0, CHAPTER 7, APPLICATIONS OF FOUR OPERATIONS, Exercise 7A, Solve the following., I Solution:, 18 9 + (16 - 2) x 5, a., = 18 ÷ 9 + 14 × 5, %3D, = 2 + 14 x 5, = 2 + 70, = 72, 2., 5., 2.

Page 3 :
b. If 10 pens costs 200, find the cost of the 20 pens., The cost of 20 pens is = ?, The cost of 10 pens = 200, h 25 - 8 of 2 (27 - 23), - 25 - 16 (27- 23) = 25 - 16 + 4, = 25 - 4, = 21, 36 + 3 x 5 - 17 x 2, C., = 12 x 5 - 17 x 2, = 60 - 34, = 26, d. (49 - 17) x 2 + (9 + 3) - 4, = 32 x 2 + 12 - 4, = 64 + 12 - 4, = 76 - 4, = 72, 9 x (3 x 14) 7 - 50, = 9 x 42 + 7-50, е., = 9 x 6 - 50, = 54 - 50, = 4, f. 13 of 2 - 16 of 2 8, = 26 - 32 8, = 26 - 4, = 22, g. 17 + 46 23 x 19 - (3 + 9) + 6, = 17 + 46 23 x 19 - 12 6, = 17 + 2 x 19 - 2, = 17 + 38 - 2, = 55 - 2, = 53, h. 60 2 of (3 + 2) + 13, = 60 = 2 of 5 + 3, = 60 10 + 13, = 6 + 13, = 19, Exercise 7b, Answer the following problems., a., If I book costs 12, find the cost of 5 books., Solution:, The cost of 1 book = 12, Cost of 5 books = R12 x 5 = 360, The Cost of 5 books is 60., Solution:

Page 4 :
The cost of 1, 200 10 = 20, pen, Then, cost of 20, 20 x 20 = 400, pens, The cost of 20 pens is 400., IC,, If Ramesh earns 750 in 3 days, how much money, will he earn in 5 days?, Solution:, Ramesh earn 750 in 3 days., Money earn in 5 days = ?, Money earn in 1 day = 750 3 = 250, Money earn in 5 days = 250 x 5 = 1250, Ramesh earn 1250 in 5 days., d., If 2 boxes of apples weigh 5 kg, what will be the, weight of 8 boxes?, Solution:, The weight of 2 apple boxes is 5 kg., The weight of 8 apple boxes is = ?, The weight of 1 apple box = 5 2 = 2.5 kg, Weight of 8 apple boxes = 2.5 x 8 = 20 kg, The weight of 8 apple boxes is 20 kg., i e., 6 books cost 7900. What is the cost of 11 books?, Solution:, The cost of 6 books = 900, The cost of 11 books = ?, The cost of 1 book 900 6 = 150, The cost of 11 books 150 x 11 = 650, The cost of 11 books is 3650., | Exercise 7C, Answer the following problems., Rahul bought a sofa set for 25,000 and sold it for, 32,000. What was his profit or loss?, i a., Solution:, Rahul bought sofa set for 25,000., Sold it for 32,000, Cost price = 25,000, Selling price = 32,000, Rahul earns profit as the cost price is less than selling, %3D, IS., price., Profit = S.P - C.P, = 32,000 – 25,000, 0 pens., = 7000, Rahul earns profit of 7000.

Page 5 :
b. Harish weaves baskets at his home in Assam. He, makes a profit of 7350 on a basket he sells for 2800., What is the cost of the basket?, Solution:, His profit = 350, The selling price of the basket = 7800, Cost price = Selling price Profit, %3D, = 800 - 350, = 450, The cost of basket is 450., A shopkeeper bought goods worth 7800. His, overhead, C., expenses were 3500., Solution:, He sold the goods for 13,600. What was his profit, or loss?, The cost price of the goods 7800., Overhead expenses, %3D, 73500., Total cost price of goods, = Cost price of goods + Overhead expenses, = 7800 + 35003D11,300, The selling price of goods = 13,600., As selling price is more than final cost. He earns profit., Profit = S.P - C.P, = 13,600 – 11,300, = 2300, Shopkeeper earns profit of 2300., d. Parth bought bike for 42,000. He spent 1800, on repairing some of its parts. Later, he sold it for, 41,000. How much profit or loss did he make?, Solution:, The cost price of bike = 42,000, Overhead expenses on the bike = 1800, Total cost price of the bike = 42,000 + 1800 = 43,800, The selling price of the bike 741,000, Total cost price of the bike is more than selling price,, hence Parth had loss., Loss = C.P- S.P 43,800 - 41,000 = 2800, Parth suffered a loss of 2800., Rohit bought goods worth 1300. He sold them to, make a profit of 3250. What was the selling price?, е., Solution:, The cost price of the goods = 1300.