Total number of cans that need to be collected = 325
Number of cans collected in first week = 135
Number of cans collected in the second week = 89
The number of cans collected in third week = c
Then the inequality equation will be
135 + 89 + c = 325
224 + c = 325
c = 325 - 224
= 101
So at least 101 cans are required to meet the goal and more that 101 cans will surpass the goal.