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10. Direct and Inverse Proportions
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Q7 of 32 Page 242

If 15 workers can build a wall in 48 hours, how many workers will be required to do the same work in 30 hours?

Given: Number of workers that can build a wall in 48 hours = 15

To find: Number of workers that can build a wall in 30 hours


Formula:


Substituting x1 = 48, y1 = 15 x2 = 30 in the formula,



Gives y2 = 24


∴ 24 workers can build the wall in 30 hours.


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6

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A School has 8 periods a day each of 45 minutes’ duration. How long would each period become, if the school has 6 periods a day? (assuming the number of school hours to be the same)

9

If z varies directly as x and inversely as y. Find the percentage increase in z due to an increase of 12% in x and a decrease of 20% in y.

Questions · 32
10. Direct and Inverse Proportions
1 2 3 4 5 6 7 8 9 10 11 1 1 1 2 3 1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5
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