You build a square with candy pieces and have 15 left over. After adding 22 more pieces, you make a larger square. How many did you have to start with?

Answer 1

originally 339 pieces, forming an 18 by 18 square with 15 left over

18x18=324

339-324 = 15

add 22 and form a larger square 19by 19 19^2 =361

361-339= 22