Of the 850 students who wrote an entrance examination at a center, 550 did very well in the Mathematics and Logical reasoning paper, 600 did very well in English language proficiency and 350 did very well in both. How many students did not do very well in Mathematics and Logical reasoning?

It is given that there are a total of 850 students, 550 did well in mathematics and logical reasoning paper and 600 did well in English language proficiency paper and 350 did well in both.

Number of students who did not do well in mathematics and logical reasoning paper would simply be

Total students - Number of students who did well in Mathematics and logical reasoning paper i.e. 850 - 550 = 300.