There is 117 grams (g) of acid in 900 g of a solution of acid and water. What percent of the solution is acid?

177/900=R/100
R*900=177*100
R=17,000/900
R=19.667
I WOULD ROUND THAT TO 20%
SO R =20%

AM I CORRECT IF NOT PLEASE EXPLAIN WHAT I DID WRONG

Yes, that is correct.