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प्रश्न
A dozen bananas costs ₹ 20. What is the price of 48 bananas?
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उत्तर
Let the required price be ₹ x.
As the number of bananas increases price also increases
∴ Number of bananas and cost are in direct proportion.
| Number of bananas | 1 dozen = 12 | 48 |
| Cost in rupees | 20 | x |
`(x_1)/(y_1) = (x_2)/(y_2)`
`12/20 = 48/x`
x = `(48 xx 20)/12`
x = 80
∴ Price of 48 bananas = ₹ 80.
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संबंधित प्रश्न
In which of the following tables x and y vary directly?
(i)
| a | 7 | 9 | 13 | 21 | 25 |
| b | 21 | 27 | 39 | 63 | 75 |
(ii)
| a | 10 | 20 | 30 | 40 | 46 |
| b | 5 | 10 | 15 | 20 | 23 |
(iii)
| a | 2 | 3 | 4 | 5 | 6 |
| b | 6 | 9 | 12 | 17 | 20 |
(iv)
| a | 12 | 22 | 32 | 42 | 52 |
| b | 13 | 23 | 33 | 43 | 53 |
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