when I triple a number and add 20 i will get 5he same answer as i do when i subtract the number from 40 find the number

sorry this example

Let that certain number be x.

3x + 2 = 50 - x

3x + x = 50 - 2

4x = 48

x = 48/4

x = 12

That certain number is 12.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign