Math miscellaneousHard
Question
The average marks of boys in a class is 52 and that of girls is 42. The average marks of boys and girls combined is 50. The percentage of boys in the class is
Options
A.40
B.20
C.80
D.60
Solution
52x + 42y = 50 (x + y)
2x = 8y
⇒
and 
∴ % of boys = 80.
2x = 8y
⇒
and ∴ % of boys = 80.
Create a free account to view solution
View Solution FreeMore Math miscellaneous Questions
The remainder left out when 82n - (62)2n + 1 is divided by 9 is...A person wants to reach from A to B by moving upward or rightward direction only taking one unit step at time, then numb...z and w are two non zero complex no.s such that |z| = |w| and Arg z + Arg w = π then z equals...If an = having n radical signs then by methods of mathematical induciton which is true...If | a |=5, | b | = 4, | c | = 3 thus what will be the value of | a.b + b.c + c.a |, given that = 0...