Subject: General Aptitude · Chapter: Average · Exam: · Marks: · Difficulty:
Out of 9 persons, 8 persons spent ₹ 30 each for their meals. The ninth one spent ₹ 20 more than the average expenditure of all the nine. The total money spent by all of them was
(a)₹ 260
(b)₹ 290
(c)₹ 292.50
(d)₹ 400.50
Answer
Answer (as printed): C
Explanation
Let the average expenditure be ₹ $x$. Then, $$\begin{aligned} & 9 x=8 \times 30+(x+20) \text { or } 9 x=x+260 \text { or } 8 x=260 \\ & \text { or } x=32.50 . \\ & \therefore \quad \text { Total money spent }=9 x=₹(9 \times 32.50)=₹ 292.50 . \end{aligned}$$
Explanation as extracted from the printed page; notation may be imperfect.