Question

Caroline learns $4$ math ideas in $2$ days. Assuming her rate of learning math stays the same, how many days will it take for her to learn $28$ new math ideas?

• A. $14$
• B. $12$
• C. $15$
• D. $16$

Answer 1

The correct option is A $14$

Time taken to learn $4$ math ideas $=2$ days
Unit rate $=\frac{4\text{Math ideas}}{2\text{Days}}$

$=2\frac{\text{Math ideas}}{\text{Day}}$
Since she learns $2$ math ideas in one day, one math idea will be learned in $\frac{1}{2}$ day.
Thus, $28$ math ideas will be learned in
$=\frac{1}{2}\times 28$
$=14$ days