Discussion
What fraction should be added to the sum of \(5\frac{3}{4}\), \(4\frac{4}{5}\) and \(7\frac{3}{8}\) to make the result a whole number?
Answer: C
The sum is 5.75 + 4.8 + 7.375 = 17.925. To reach the whole number 18 we need 0.075, which is 3/40, option C.
1/40, 2/40 and 4/40 would leave the total at a non-whole number.
To add the fractions, use the common denominator 40: 3/4 = 30/40, 4/5 = 32/40 and 3/8 = 15/40, so the fractional parts add up to 77/40, or 1 and 37/40. The whole numbers add to 16, so the total is 17 and 77/40, which needs 3/40 more to make 18.
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