After MM students took a test, there was a total of 64% of correct answers. If the test contains 50 questions, what is the least number of questions that the next student have to get right to bring the total of correct answers to 70% ?

Since the total percentage of the correct answers that the students supplied is 64% and the test contained a total of 50 questions, it is very important that we calculate the total amount of questions that mm students answered correctly out of the 50 questions asked in order to be able to get 64% of them right.

= (64/100) × 50 = 32 correct answers. The students answered 32 questions correctly out of the 50 available questions.

Now, if the percentage of correct answers must rise to 70%, how many more questions must be correctly answered to achieve this?

To discover the least amount of further questions that must be answered correctly to bring the total percentage of correct answers to 70% from 64%, we need to calculate the total amount of questions that must be answered to get 70% right.

----- let us use "y" to represent that unknown amount in the equation below

(y/50) × 100 = 70%

2y = 70

y= 35 correct answers

Therefore, MM students must answer 35 questions correctly out of 50 questions in order to have 70% of the questions right.

So, if they already answered 32 questions correctly out of a total of 50 questions (which is 64%), the least number of questions that the next student must answer correctly to bring the total amount of correct answers to 70% will be :

35 correct answers (70%) - 32 correct answers (64%) = 3 correct answers. The next student must supply 3 more correct answers to get the total percentage of correct answers to 70%