Henry Ernest Dudeney/Modern Puzzles/189 - Weighing the Baby/Solution

by : $189$

 * Weighing the Baby

Solution
The baby weighs $30$ pounds.

The man weighs $141$ pounds, and Fido weighs $9$ pounds.

Proof
Let $m$, $b$ and $F$ be the weights of man, baby and Fido respectively.

We have: