Answer to Question #99624 in Algebra for Abubakar

Question

Out of 400 students in a final year of a senior secondary, 300 are offering Biology and 190 are offering Chemistry. 1. How many students are offering both Biology and Chemistry if 70 students are offering neither Biology nor Chemistry. How many students are offering Biology only?

Answer 1

70+300+190-x=400;

x=160 is the number of pupils who learn biology and chemistry;

300-160=140 is the number of pupils who learn biology only.