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.

answer: for each 3 girls there is 2 boys . 3: 2

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walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40