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Direct And Inverse Proportions
Question
Observe the following tables and find which pair of variables (here x and y) are in inverse proportion.
(i)
|
X |
50 |
40 |
30 |
20 |
|
y |
5 |
6 |
7 |
8 |
(ii)
|
X |
100 |
200 |
300 |
400 |
|
y |
60 |
30 |
20 |
15 |
(iii)
|
X |
90 |
60 |
45 |
30 |
20 |
5 |
|
y |
10 |
15 |
20 |
25 |
30 |
35 |
Solution
(i) ∵ X1 = 50 and Y1 = 5 
x1Y1 = 50 x 5 = 250
X2 = 40 and Y2 = 6 x2Y2 = 40 x 6 = 240
X3 = 30 and Y3 = 7 x3Y3 = 30 x 7 = 210
X4 = 20 and Y4 = 8 x4Y4 = 20 x 8 = 160
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Some More Questions From Direct and Inverse Proportions Chapter
Observe the following tables and find if x and y are directly proportional.
(i)
|
X |
20 |
17 |
14 |
11 |
8 |
5 |
2 |
|
y |
40 |
34 |
28 |
22 |
16 |
10 |
4 |
(ii)
|
X |
6 |
10 |
14 |
18 |
22 |
26 |
30 |
|
y |
4 |
8 |
12 |
16 |
20 |
24 |
28 |
(iii)
|
X |
5 |
8 |
12 |
15 |
18 |
20 |
|
y |
15 |
24 |
36 |
60 |
72 |
100 |
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|
Number of bottles filled |
Number of hours |
|
840 |
6 |
|
X |
5 |
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Mock Test Series
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