A number is three times another number. The difference of these two numbers is 10. Find these number.

5,15

Step-by-step explanation:

let the numbers be x and y

but y = 3x

3x - x = 10

2x = 10

x = 5

Step-by-step explanation:

Let the first number be x.

Let the second number be y.

x is 3 times y.

Difference of x and y is 10.

Put x as 3y in the second equation.

Combine like terms.

Divide both sides by 2.

Plug y as 5 in the first equation.

Multiply.

The two numbers are 15 and 5.

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.