Question 64
The average marks obtained by a class of 60 students is 65. The average marks of half of the students is found to be 85. The average marks of the remaining students is
Solution
Average marks of 60 students = 65
=> Total marks of 60 students = $$60 \times 65=3900$$
Average marks of half students i.e. $$\frac{60}{2}=30$$ students = 85
=> Total marks of 30 students = $$30 \times 85=2550$$
Total marks of remaining 30 students = $$3900-2550=1350$$
$$\therefore$$ Average marks of remaining 30 students = $$\frac{1350}{30}=45$$
=> Ans - (B)
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