9514 1404 393
Answer:
10 23/24 kg
Step-by-step explanation:
Subtract the numbers given away from the number Mrs. Roxas bought:
20 -5 2/3 -3 3/8 = 20 -5 -3 -(2/3+3/8) = 12 -25/24 = 10 23/24
Mrs. Roxas has 10 23/24 kg of sweet mangoes left.
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Additional comment
Without worrying too much about "common denominator", you can always add fractions with the formula a/b +c/d = (ad +bc)/(bd). You can always reduce the sum, if necessary. Subtraction is just addition of a number that has a negative sign.
It is often convenient to deal separately with the integer and fractional parts when adding or subtracting mixed numbers.
