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A baker made 20 pies. A Boy Scout troop buys one-fourth of his pies, a preschool teacher buys one-third of his pies, and a caterer buys one-sixth of his pies. How many pies does the baker have left?
Detailed Explanation
Convert the different denominators to a common denominator that all the denominators can divide into evenly.
4, 3, and 6 all divide evenly into 12.
To convert $$\frac{\mathrm{1} }{\mathrm{4}}$$ to $$\frac{\mathrm{x} }{\mathrm{12}}$$, divide 12 (the new common denominator) by 4 (the old common denominator) to get 3.
Then multiply $$\frac{\mathrm{1} }{\mathrm{4}}$$ by $$\frac{\mathrm{3} }{\mathrm{3}}$$ (another way of saying 1).
The product is 3/12. (1/4 = 3/12).
Do the same calculation for the other fractions: $$\frac{\mathrm{1} }{\mathrm{3}}$$ = $$\frac{\mathrm{4} }{\mathrm{12}}$$ and $$\frac{\mathrm{1} }{\mathrm{6}}$$ = $$\frac{\mathrm{2} }{\mathrm{12}}$$.
Then add the new numerators together: 3 + 4 + 2 = 9.
This gives you your new added numerator. Place the added numerator over the new denominator, and you can see that $$\frac{\mathrm{9} }{\mathrm{12}}$$ of the pies have been sold.
$$\frac{\mathrm{9} }{\mathrm{12}}$$ can be reduced to $$\frac{\mathrm{3} }{\mathrm{4}}$$. $$\frac{\mathrm{3} }{\mathrm{4}}$$ or 75% of the pies have been sold.
20 × 0.75 = 15. 15 of 20 pies have been sold. 20 – 15 = 5 pies remaining.
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