Question

help me
6. When a person calculated his expenses from Sunday to
Thursday, he found the average expenditure to be 400 rupees
per day. Including Friday, the average increased to 430 rupees
per day. How much did he spent on Friday? Including Saturday,
the average decreased to 390 rupees per day. How much did
he spend on Saturday?​

Answer 1

Answer:

30 extra in each day and

Answer 2

Answer:

we will use the formula of average.

Step-by-step explanation:

average of expenditure=

$\frac{total \: expenditure}{total \: no \: f \: days }$

so, let's first give some short forms to the days.

Sunday= s; monday= m; Tuesday= t;

Wednesday= w; Thursday= x; Friday= f;

Saturday= y;

case one

average expenditure= (s+m+t+w+x)/5

400=(s+m+t+w+x)/5

400(5)= (s+m+t+w+x)

(s+m+t+w+x)= 2000rupees (eq 1)

case two

average expenditure =(s+m+t+w+x+f)/6

430(6)= {(s+m+t+w+x)+f}

2580 = (s+m+t+w+x)+f ( eq 2)

2580 = 2000+ f ( from eq 1)

f= 2580-2000

f= 580 rupees

so, expenditure on Friday is of 580 rupees

case two

average expenditure =(s+m+t+w+x+f+y)/7

390(7)= {(s+m+t+w+x+f)+y}

2730 = 2580 +y

y= 2730-2580

y= 150 rupees

so expenditure on Saturday is of 150 rupees.

Thank you