Gabriel multiplied a number by 5 instead of 3. The answer that he got was 12 more than the correct answer. What was the original number?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

15/16 as a decimal rounded to the nearest hundredth

Each cookie sells for $0.50 sam spent $90 on baking supplies and each cookie cost $0.25 to make how many cookies does sam need to sell before making a profit formula: sales> cost