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Question
The sum of two rational numbers is `9/20`. If one of them is `2/5`, find the other.
Solution
The sum of two rational number = `9/20`
And, one of the numbers = `2/5`
The other rational number
`= 9/20 - 2/5`
| 2 | 20, 5 |
| 2 | 10, 5 |
| 5 | 5, 5 |
| 1, 1 |
LCM of 20 and 5 = 20
`= (9xx1)/(20xx1) - (2xx4)/(5xx4)`
LCM of 20 and 5 = 20
`= 9/20 - 8/20`
`= (9-8)/20 = 1/20`
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