Question

On Halloween night, Mack collects x pieces of candy and then eats 7 pieces. The next day he eats 10% of his candy pieces and has 63 pieces remaining. How many pieces of candy did he collect on Halloween night?​

Answer 1

Building and solving an equation to model the situation, it is found that he collected 78 pieces of candy on Hallowen night.

• Initially, he collected x pieces.
• Ate 7, thus $x - 7$.
• On the next day, eats 10%, and has 63 remaining, thus $x - 7 - 0.1x = 63$

Solving for x, we find how many pieces of candy he collected, thus:

$x - 7 - 0.1x = 63$

$0.9x = 70$

$x = \frac{70}{0.9}$

$x = 77.8$

Rounding, he collected 78 pieces.

A similar problem is given at brainly.com/question/24812278