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10. Direct and Inverse Variable
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Q9 of 41 Page 10

In a hostel of 50 girls, there are food provisions for 40 days. If 30 more girls join the hostel, how long will these provisions last?

Let the number of days is


Total number of girls = 50 + 30 = 80














Girls



50



80



Time (days)



40



x





Therefore the number of days the food will last is 25 days


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A work-force of 420 men with a contractor can finish a certain piece of work in 9 months. How many extra men must he employ to complete the job in 7 months?

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1200 men can finish a stock of food in 35 days. How many more men should join them so that the same stock may last for 25 days?

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A car can finish a certain journey in 10 hours at the speed of 48 km/hr. By how much should its speed be increased so that it may take only 8 hours to cover the same distance?

11

1200 soldiers in a fort had enough food for 28 days. After 4 days, some soldiers were transferred to another fort and thus the food lasted now for 32 more days. How many soldiers left the fort?

Questions · 41
10. Direct and Inverse Variable
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