Page 32 - SM inner class 7.cdr

One number = 2.1 46
Other number = 4263 21. ¸ . 925 42550
4263 10 – 3700
´
.
= 4263 ¸ 21 5550
.
21 10 – 5550
.
´
0
20.3
21 426.3 The cost of the cloth per metre = ` 46
– 42 Ex am ple 26. One kg Basmati rice costs `
063 43.75. Find the cost of 17 kg of rice.
– 63
0 So lu tion : Cost of 1 kg rice = 43.75
Cost of 17 kg rice = 4375. ´17
Therefore, the other number is = 20.3
43.75
Ex am ple 25. John bought 9.25m of cloth for
` 42550 Find the cost price per metre. ´ 17
.
30625
So lu tion : Cloth bought by John = 9.25 m + 43750
.
Cost of 925. m = 42550 743.75
Cost per metre = 42550 925. ¸ . Therefore, 17 kg rice cost ` 743.75
´
.
42550 100
¸
= 42550 925
.
925 100
´
E xercise 3.4

1. A mo tor bike cov ers a dis tance of 62.5 km.con sum ing one litre of petrol. How much dis tance does it
cover for 15 litres of petrol?
2. A truck cov ers a dis tance of 92.5 km in 2.5 hours. If the truck is trav el ling at the same speed through out
the jour ney what is the dis tance cov ered by it in 1 hour?
3. The length of a rect an gle is 7.1 cm and its breadth is 2.5 cm. What is the area of the rect an gle?
4. A con tainer con tains 12.5 litre of oil. How many such con tain ers con tain 162.5 litre of oil?
5. A store owner has 7.11kgs of candy. If she puts the candy into 9 jars, how much candy will each jar
con tain?
6. A girl earns `11.75 per hour for gar den ing. If she worked 21 hours this month, then how much did she earn?
7. School lunches cost ` 14.50 per day. About how much would one week of lunches cost?

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Mathematics In Focus - 7