75% of students of a class answered Question No. 1 correct and 55% answered Question No. 1 correct and 20% answered neither question correctly . What percent of students answered both question correctly ?
Created: 6 years ago |
Updated: 3 years ago
best des
Students answer Q.1 or Q.2 or both correctly = ( 100 - 20) = 80%
Let, x% students answered both correctly
( 75 - x) + ( 55 - x) + x = 80
130 - x = 80
x = 50
Md Azizur Rahman
Founder of Satt
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