10. In a class of 45 students, 30 opted for Mathematics and 32 opted for Biology. How many have opted for both Mathematics and Biology ? How many have opted for only Mathematics ?
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LET NO OF STUDENTS WHO OPTED MATHS AND BIO BOTH BE x
NOW ,
TOTAL NO. OF STUDENTS = 45
30 - x + x +32 -x =45
62 -x =45
x = 17
therefore who chose maths and bio both are 17 students'
no of students who opted maths only = 30 - 17 = 13 students
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