1. The problem asks for multiplication sums where a whole number multiplied by a fraction equals a given fraction. We need to find pairs of whole numbers and fractions that satisfy these equations. 2. The general formula for such problems is: $$\text{whole number} \times \text{fraction} = \text{fraction}$$ 3. To find the whole number, we can rearrange the formula: $$\text{whole number} = \frac{\text{resulting fraction}}{\text{fraction}}$$ 4. Since the problem does not provide specific fractions for a to f, we cannot compute exact values. However, the example shows: $$1 \times \frac{3}{2} = 6$$ 5. For question 3, "One fifth of 15 cell phones were sold on a special. What fraction were not sold?": - One fifth sold means fraction sold is $\frac{1}{5}$. - Fraction not sold is $1 - \frac{1}{5} = \frac{4}{5}$. 6. For problem solving 1, "(whole number) x (fraction) = (fraction)": - There are infinitely many solutions because any whole number multiplied by a suitable fraction can produce a fraction. Final answers: a-f: Cannot determine without specific fractions. 3. Fraction not sold = $\frac{4}{5}$. Problem solving 1: Infinite solutions.