Question

There were 75 customers in the store at 1 o'clock the store must be emptied by 5 how many customers must leave the store between 4 o'clock and 5 o'clock

Answer 1

first you got 2 steps and then you do 75+5+5=85 then you do 85+4+1=90 so the answer is 90

Answer 2

Number of customers in the store at 1 o'clock=75 customers

If 'n' numbers of customers who left the store before or till 4 PM, then number of customers left in the store = 75 -n

So, customers who are left in store , that is 75-n,= should leave the store in between 4 o'clock and 5 o'clock.

→75-n=Number of Customers who are in store after 4 o' clock.