1 The SAT writers would love for you to set up a simple proportion here and solve:

    \begin{align*}\dfrac{2}{7}=\dfrac{x}{63}\end{align*}

Hooray! x=18! That’s answer choice D! Not so fast, Dr. Moreau. You just conjured a terrifying hybrid beast, the COWNIMALKEN. Let’s look at that fraction more carefully, with the units included:

    \begin{align*}\dfrac{2\text{ cows}}{7\text{ chickens}}=\dfrac{x\text{ cows}}{63\text{ animals}}\end{align*}

So…

This content is for Members only.

Buy a Math Guide or Subscribe
Verify your Math Guide ownership

Already a member? Log in here