If 88 MB is used out of 5 gb how many is left

5 gb= 5*230 bits
88 mb= 88*220 bits

Therefore if 88 mb is used out of 5 gb then
= 5 gb - 88 mb bits are left
= 5*2 30 bits - 88*220 bits
= 220(5*210-88) bits
= 220(5*1024-88) bits
= 220*5032 bits
= 5032 mb are left