Answer:
68
Step-by-step explanation:
The average of the marks obtained by Abdul and Mariya in Maths is 56.
Average mark = Summation of their two marks / their number
56 = Summation of their two marks / 2
Summation of their marks = 2 × 56 = 112.
If the marks obtained by Hari is included, let Hari' s mark be x then
New average mark = Summation of their three marks / 3
New average mark = (Summation of their two marks + x) / 3
60 = (112 + x) / 3
112 + x = 60 × 3
112 + x = 180 Add -112 to both sides
x = 180 - 112
x = 68
Therefore, the mark obtained by Hari is 68.
