Question

Kittens weigh about 100 grams when born and gain 7 to 15 grams per day. If a kitten weighed 100 grams at birth and gained 8 grams per day, in how many days will triple its weight

Answer 1

Solve in two steps the following equation:

8d + 100 = 300 where d=number of days.

Step 1: add -100 to both sides
Step 2: you figure it out. It's easy.