25% of the students in a class got an A+ on a test. 30% of the rest got an A−. 40% of the rest got grade B. The rest of students scored lower than B.

Question

the last part to the question is: What percent of all students got a grade lower than B?

 

 

thank you

Answer 1

You start off with 100%, since that encompasses the total number of people. From there, we start subtracting the percentages of the other grades:

100% - 25% = 75%

75% - 30% = 45%

45% - 40% = what?

 

That 'what' will be your final answer