Question

Divide $15÷\frac{5}{2}$ to unlock the card and save the mercury.

• A. 6
• B. $\frac{1}{6}$
• C. $\frac{75}{2}$

Answer 1

The correct option is A 6

We can write 15 as $\frac{15}{1}$
$15÷\frac{5}{2}=\frac{15}{1}÷\frac{5}{2}$

Take a reciprocal of the second fraction and multiply with the first fraction as follows

$\frac{15}{1}÷\frac{5}{2}=\frac{15}{1}\times \frac{2}{5}=\frac{15\times 2}{1\times 5}=\frac{3\times 5\times 2}{1\times 5}=\frac{3\times 2}{1}=6$
Hence, $15÷\frac{5}{2}=6$