Question

In a test, the average marks obtained by boys and girls in a class are 72 and 56 respectively. The average marks obtained by the whole class in the same test is 60. If in an other test, the average marks obtained by the boys and girls are 64 and 80 respectively, then what is the average marks obtained by the whole class in the test? 76 74 72 79

Answer 1

Answer:

sorry for irreversible ans

Answer 2

Answer:

as we know boys avg is 72 and girls avg is 56

overall avg for same subject is 60

then

72 56

\. /

60

/. \. (do cross minus/ we can say use alligation)

4. 12

now we can say ratio of boys to girls is= 4/12= 1:3

64*1+80*3= 304/1+3= 304/4= 76