Carl has 10% more pieces of candy than Bill. If Carl gives 20 sweets to Bill, they will have the same number of sweets. How many sweets does Bill have?

sweets

Set Bill's pieces of candy as 100%, then Carl's sweets is 100% + 10% = 110%

Since they will have the same number of pieces of candy if Carl gives 20 pieces to Bill, Carl has (202) more pieces than Bill

Then, use the formula: Whole = Difference amount ÷ Percentage difference

Whole: Bill's sweets

Difference amount: 20 × 2 = 40

Percentage difference: 10%

Then, Bill's sweets: 4010% = 400