Question

A Saint Bernard puppy weighs 21 pounds at nine weeks old. After that, it gains pounds per week on average. How many weeks old must the puppy be if it weighs 25 pounds now?

Answer 1

The Saint Bernard puppy must be approximately 13 weeks old if it currently weighs 25 pounds.

Step-by-step explanation:

Determining the age of the Saint Bernard puppy involves considering its weight gain rate. Starting at 21 pounds at nine weeks old and gaining pounds per week on average, we can use the formula:

Weight = Initial Weight + (Pounds gained per week * Number of weeks)

Given the current weight (25 pounds) and the initial weight (21 pounds), the pounds gained per week can be calculated by subtracting the initial weight from the current weight: 25 - 21 = 4 pounds gained since its initial weight.

Now, knowing the number of pounds gained per week (4 pounds), we can deduce the number of weeks it took for this gain by dividing the total pounds gained by the weekly gain: 4 pounds / 1 pound per week = 4 weeks.

Adding these four weeks to the initial age of 9 weeks, the puppy must be approximately 13 weeks old now. Therefore, at its current weight of 25 pounds, the Saint Bernard puppy should be around 13 weeks old. This calculation assumes a consistent weekly weight gain rate.