What is the value of $\frac{6}{3} \times \frac{9}{6} \times \frac{12}{9} \times \frac{15}{12}$ ?
Calculating,

$$
\frac{6}{3} \times \frac{9}{6} \times \frac{12}{9} \times \frac{15}{12}=\frac{6 \times 9 \times 12 \times 15}{3 \times 6 \times 9 \times 12}=\frac{(6 \times 9 \times 12) \times 15}{3 \times(6 \times 9 \times 12)}=\frac{15}{3}=5
$$

ANSWER: 5

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