Question

A deer grows 170% from birth to age 1. If a deer weighs 68 pounds at age 1, how much did it weigh at birth?

Answer 1

Let's define

x: deer weight at birth

y: deer weight at age 1

If a deer grows 170% from birth to age, then

$x\cdot\frac{170}{100}=y$

If a deer weighs 68 pounds at age 1, therefore y = 68. Solving for x,

$\begin{gathered} x\cdot\frac{170}{100}=68 \\ x=68\cdot\frac{100}{170} \\ x=40 \end{gathered}$

It weighed 40 pounds at birth