If one fourth of a certain number is added to one fifth of the same number, the result equals the sum of 13 and one eighth of the number. Find the number.

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let x be the number.
x/4 + x/5 = 13 + x/8
10x+8x=520+5x Multiply 40 by both sides to eliminate fractions.
18x-5x=520+5x-5x
13x=520
13x/13=520/13
x=40
Always check:
40/4 + 40/5 = 13 + 40/8 true
Ed

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