In an examination, a student secures 40% and fails by 10 marks. If he scored 50%, he would pass by 15 marks. Find the minimum marks required to pass the exam.
a. 250                          b. 100                          c. 110              d. 125

50% of max marks – 40% of max marks = 25
 max marks = 250
Pass marks = 40% of max + 10 => 100 + 10 = 110.