Page 105 - ICSE Math 7

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8. Find x if , x and are in continued proportion.
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9. The weight of 7 notebooks is 5.25 kg. What is the weight of 12 such notebooks?

10. A typist can type 26 pages in 390 minutes. How long will he take to type 39 pages?
11. In a hostel, there is provision for food for 46 students for 12 days. For how many students will
the same food last for 8 days?
12. A bike can cover 408 km with 8 litres of petrol. How many litres of petrol will be needed to cover
550 km?

13. Two pipes can fill a tank in 3 hours and 6 hours respectively. A third pipe can empty it in 9 hours.
If the tank is empty and all the pipes are opened together, in how many hours will the tank be
full.
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14. In 8 days, P can do of a job and Q can do of the job. In how much time will they complete
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1 of the job if they work together? 3
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15. A carpenter makes a new table in 3 days by working 8 hours a day. For how many hours per day
must he work to make the same table in 2 days?

THINK SMART

1. Seema’s age is mean proportional between the ages of Tarun and Suchit. If Tarun’s age is
4 months and Suchit’s age is 1 year 4 months, find Seema’s age.
2. A carpenter X can make a chair in 2 days and another carpenter Y can make the same chair in
3 days. If they work together, then in how many days will they make:
(a) a chair (b) 15 chairs

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