Question

How many one fourths need to be added to $2\frac{1}{4}$ to make 5?

• A. 3
• B. 4
• C. 5
• D. 11

Answer 1

The correct option is D

11

Let the number of one fourths to be added be $n$.
$\Rightarrow 2\frac{1}{4}+n\times \frac{1}{4}=5$
$\Rightarrow \frac{9}{4}+n\times \frac{1}{4}=5$
$\Rightarrow n\times \frac{1}{4}=5-\frac{9}{4}$
$\Rightarrow n\times \frac{1}{4}=\frac{11}{4}$

$\Rightarrow n=\frac{11}{4}÷\frac{1}{4}$
$\Rightarrow n=\frac{11}{4}\times \frac{4}{1}$
$\Rightarrow n=11$
Therefore, 11 one fourths need to be added to $2\frac{1}{4}$ to make 5.