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10. Direct and Inverse Proportions
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Q2 of 32 Page 239

A school wants to spend Rs 6000 to purchase books. Using this data, fill the following table.

Formula: xnyn = 6000 where n = 1,2,3….

x1 = 40, y1 = 150 x1y1 = 6000


x2 = 50, y2 = ? x2y2 = 6000 y2 =


x3 = ?, y3 = 100 x3y3 = 6000 x3 =


x4 = 75, y4 = ? x4y4 = 6000 y4 =


x5 = ?, y5 = 75 x5y5 = 6000 x5 =


The completed table would be



More from this chapter

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1

Observe the following tables and find which pair of variables (x and y) are in inverse proportion

1

Observe the following tables and find which pair of variables (x and y) are in inverse proportion

3

Take a squared paper and arrange 48 squares in different number of rows as shown below:



What do you observe? As R increases, C decreases


(i) Is R1 : R2 = C2 : C1?


(ii) Is R3 : R4 = C4 : C3?


(iii) Is R and C inversely proportional to each other?


(iv) Do this activity with 36 squares.

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Siri has enough money to buy 5 kg of potatoes at the price of Rs 8 per kg. How much can she buy for the same amount if the price is increased to Rs 10 per kg?

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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