PLEASE HELPPim confused​

Pls i’m too dumb to know what i’m doing right now

What is the equation and solution for the sentence? the sum of a number and thirty-one is one hundred thirteen. write the equation as n-31=113 and subtract 31 from both sides. the answer is 82. write the equation as n+31=113 and subtract 31 from both sides. the answer is 82. write the equation as n+31=113 and add 31 to both sides. the answer is 144. write the equation as n-31=113 and add 31 to both sides. the answer is 144.

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.