Question

The average pocket money of 3 friends A, B,
C is Rs. 80 in a particular month. If B spends
double and C spends triple of what A spends
during that month and if the average of their
unspent pocket money is Rs. 60, then A
spends (in Rs.)
(a) Rs. 10
(b) Rs. 20
(c) Rs. 30
(d) Rs. 40
(e) None of these​

Answer 1

Step-by-step explanation:

your answer is e) None of these

Answer 2

Answer:

(d.) 40

Step-by-step explanation:

Average money

$= \frac{su m \: of \: all \: terms }{number \: o f \: terms} \ = \frac{a + b + c}{3} \\ = 80 \: rupees(given)$

Let expenditure of A be 'x'

Then expenditure of B = 2x

Expenditure of C= 3x

Then according to above mentioned formula,

$\frac{x + 2 x+ 3x}{3} = \frac{6x}{3 } = 2x$

Thus since Average expenditure is 2x,

Expenditure of A,

$2x = 80 \\ x = \frac{80}{2 } \\ x = 40$