In the arithmetic problem, the college students asked me to help me calculate how much money I lost.
You charge 105 and 105 is false, so you only have 5. If you give someone 50, it's MINUS 45. Go to the bank to change 50. 50 minus 45, only 5 yuan, 50.
55-( 105- 100-50+50)=50
Pay 50 pounds