Answer: The number is 8
Step-by-step explanation:
Let be "x" the certain number. Then "3 times a certain number" means that the number "x" is multiplied by 3. This is:
Now, "3 times a certain number is increased by 4" means that the we must add 4 to , in other words, this indicate an addition:
And finally "3 times a certain number is increased by 4 the result is 28" means that is equal to 28. Then the expression is:
To find the number "x", subtract 4 from both sides of the equation:
Dividing both sides of the equation by 3, you get that the number is: