130% of what number is 1170?
As the number has been increased by 30% to become 1170, we are expecting a number smaller than 1170 as the answer.
DO NOT be tempted to just subtract 30%. 30% of a smaller number is not the same as 30% of a larger number.
One method is to write an equation stating exactly what is asked in the question. "130% of some number is 1170."
OR, by direct proportion:
[Quick check: 130% =1.3 so