Question

there are 40 houses in the neighborhood. company x provides electricity to $\frac{1}{8}$ of the houses. company y provides electricity to $\frac{2}{5}$ of the houses. company z provides electricity to the remaining houses. how many houses in this neighborhood does company z provide electricity to?

Explanation:

Step1: Calculate houses served by Company X

$40\times\frac{1}{8}=5$

Step2: Calculate houses served by Company Y

$40\times\frac{2}{5}=16$

Step3: Calculate houses served by Company Z

$40-(5 + 16)=40 - 21=19$

Answer:

19