Let x = the unknown number.
x + 21 = 28
x + 21 - 21 = 28 - 21
x = 7
x - 12 = 30
x = ?
How do you think you should set up the third problem?
1. a number increased by 21 is 28. find the number
2. a number decreased by 12 is equal to 30. find the number.
3. 8 less than a number is 15. fid the number
2 answers
What is that