Question

A cookie recipe for $60$ cookies calls for $4$cups of flour. How much flour is needed to make $90$ cookies?

Answer 1

Step 1: Finding the cups of flour for $1$ cookie.

Given that,

For $60$ cookies $4$ cups of flour are required.

So, for $1$ cookie $\frac{4}{60}$ cups of flour are required.

Step 2: Finding the cups of flour for $90$ cookies.

Cups of flour required for $90$ cookies $=($Cups of flour required for $1$cookie$)\times 90$

$\begin{array}{rcl}& =& \frac{4}{60}\times 90\\ & =& \frac{4}{2}\times 3\\ & =& \frac{12}{2}\\ & =& 6\end{array}$

Hence, the cups of flour required for $90$ cookies are $6$.