One number is 3 more than 3 times another. The sum of the number is 15. Find the two numbers.

Question

xyz homework 

Answer 1

Here's what we know:

a = 3b (one number is 3 times as large as the other)

a + b = 15 (their sum equals 15)

 

Use the substitution method:

3b + b = 15

simplify:

4b = 15

divide both sides by 4:

b = 3.75

 

From here, you can find a.