Ann works 51/2 hours, mary works 61/3 hours, and john works 41/4 hours. how many combined hours have they worked?

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50