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Question
Set up equation and solve them to find the unknown number in the following case:
Ibenhal thinks of a number. If she adds 19 to it and divides the sum by 5, she will get 8.
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Solution
Let the number be x.
`(x+19)/5 = 8`
Multiplying both sides by 5
`((x + 19)xx5)/5`
= 8 × 5
x + 19 = 40
x = 40 - 19 ...(Transposing 19 to R.H.S.)
x = 21
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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`
