Question

The number of students who take both the subjects Mathematics and Chemistry is 70. This represents 10% of the enrollment in Mathematics and 14% of the enrollment in Chemistry. How many students take at least one of these two subjects? 

(a) 1120 

(b) 1130 

(c) 1100

(d) insufficient data

Answer 1

(b) 1130

n(M ∪ C) = n(M) + n(C) – n(M ∩ C) 

= 700 + 500 – 70 = 1130