here's an easy question of averages, but let's try to see innovative ways of solving this.
A class has 12 boys and x girls. Average score of boys and girls is 80 and 92 respectively. the average of the whole class is 86, what is the value of x?
Options
A) a) 6
B) b) 7
C) c) 8
D) d) 10
E) e) 12
12(80)+92x/12+x=86   960+92x/12+x=86   960+92x=86(12+x)   960+92x=1032+86x   X's one side, numbers one side we get,   92x - 86x=1032-960   6x=72   hence, x=12   Answer e) 12
<result>E</result>
here's an easy question of averages, but let's try to see innovative ways of solving this.
A class has 12 boys and x girls. Average score of boys and girls is 80 and 92 respectively. the average of the whole class is 86, what is the value of x?