Math Problem Statement

The class was celebrating reading week with cupcakes. The red and blue table groups ate 2/5 of the cupcakes, and the green and purple table groups ate 3/7 of the cupcakes. What fraction of the cupcakes was left? How many cupcakes might there have been

Solution

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Math Problem Analysis

Mathematical Concepts

Fractions
Addition of Fractions
Subtraction of Fractions

Formulas

Fraction addition: a/b + c/d = (a*d + b*c) / (b*d)
Fraction subtraction: a/b - c/d = (a*d - b*c) / (b*d)

Theorems

Basic Fraction Operations
Least Common Denominator

Suitable Grade Level

Grades 5-7