Peter spends 1/4 of his salary on food, 1/3 on clothing and 1/5 on school fees. He saved the rest. What fraction if his salary did he save?

well, he spent 1/4 + 1/3 + 1/5 = 47/60

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Learning

To find out the fraction of Peter's salary that he saved, we need to subtract the fraction spent on food, clothing, and school fees from 1.

Let's calculate each fraction spent:
- Peter spends 1/4 of his salary on food.
- Peter spends 1/3 of his salary on clothing.
- Peter spends 1/5 of his salary on school fees.

To combine these fractions, we need to find a common denominator. The least common multiple (LCM) of 4, 3, and 5 is 60.

Now, let's convert each fraction to have the same denominator of 60:
- Fraction spent on food: (1/4) x (15/15) = 15/60
- Fraction spent on clothing: (1/3) x (20/20) = 20/60
- Fraction spent on school fees: (1/5) x (12/12) = 12/60

Now, let's add these fractions to find the total fraction spent:
Total fraction spent = 15/60 + 20/60 + 12/60 = 47/60

Finally, to find the fraction of salary saved, we subtract the fraction spent from 1:
Fraction saved = 1 - (47/60) = (60/60) - (47/60) = 13/60

Therefore, Peter saved 13/60 of his salary.