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प्रश्न
Set up equation and solve them to find the unknown number in the following case:
Anwar thinks of a number. If he takes away 7 from `5/2` of the number, the result is 23.
उत्तर
Let the number be x
`5/2` of this number = `(5x)/2`
`(5x)/2 - 7 = 23`
`(5x)/2 = 23 + 7` ...(Transposing -7 to R.H.S)
`(5x)/2 = 30`
Multiplying both sides by 2,
`(5x xx 2)/2`
= 30 × 2
5x = 60
Dividing both sides by 5,
`(5x)/5 = 60/5`
x = 12
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For riddle answer: substitute the number for the letter it equals
`()/1 ()/2 / ()/3 ()/4 ()/5 ()/6 ()/7 ()/8/()/4 ()/9`
