Cheko and Keddy had the same amount of money initially. After Cheko donated $234 and Keddy donated $156 to charity, Keddy had 3 times as much as Cheko. How much had Keddy in the end?

At the start: k + 156 = c + 234 (1)

At the end k = 3c (2)

Put (2) into (1): 3c + 156 = c + 234

2c = 78

c = 39

so, from (3) k = 3*39 = 117

Keddy had $117 in the end.