Answer:
$33
Step-by-step explanation:
Let Kelly's pay per cake be 'x',, then Christine's pay will be 'x-11'
Kelly makes 4 cakes per hour, her hourly income is 4x
Christine makes 6 cakes per hour, her hourly income is 6(x-11)
For the two to be equal,
4x = 6(x-11)
4x = 6x - 66
6x - 4x = 66
2x = 66
x = 33
Kelly should be paid $33 per cake