Question

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 430 rupees per day how much did he spend on friday including saturday the average decreased to 390 rupees per day How much did he spend on saturday please include steps

Answer 1

Answer:

• 580
• 340

Step-by-step explanation:

Formula Method:

• Sunday to Thursday (5 days) Expenditure average 400
• Get the sum by multiplying 400X5=2000
• After adding Friday's expenditure average becomes 430, now get total 430X6= 2580
• Subtract them to get your first answer: 2580-2000=580
• After adding Saturday's expenditure, avg. becomes 390, get sum 390X6= 2340
• Subtract them to get your second answer: 2340-2000=340

Logic Method:

• Sunday to Thursday (5days) average 400
• After adding Friday avg. becomes 430, which means on Friday his expenditure was 400+(30X6)=580
• After adding Saturday, avg. decreased to 390, which means, his expenditure was less... 400- (10X6) = 340

Answer 2

Answer:

The amount spent on Friday = Rs. 580

The amount spent on Saturday = Rs. 150

Step-by-step explanation:

Given,

The average expenditure of a person from Sunday to Thursday = Rs. 400

The average expenditure of the person including Friday = 430

The average expenditure of the person including Saturday = 390

To find,

The amount he spent on Friday

The amount he spent on Saturday

Recall the formula

Average = $\frac{Sum\ of\ values}{Total \ number\ of \ values}$

Solution:

Here, Sunday to Thursday, there are 5 days,

The total number of values = 5

Since the average expenditure of a person from Sunday to Thursday  is Rs. 400, we have

400 = $\frac{Total \ expenditure }{5}$

Total expenditure from Sunday to Thursday = 400×5 = Rs. 2000

Since the average expenditure of the person including Friday is 430, we have

430 = $\frac{Total \ expenditure }{6}$

Total expenditure from Sunday to Friday = 430×6 = Rs. 2580

∴ The amount he spent on Friday = 2580 - 2000 = Rs. 580

Since the average expenditure of the person including Saturday = 390, we have

390 = $\frac{Total \ expenditure }{7}$

Total expenditure from Sunday to Saturday = 390×7 = 2730

The amount spent on Saturday = 2730 - 2580 = Rs. 150

∴ The amount spent on Friday = Rs. 580

The amount spent on Saturday = Rs. 150

#SPJ2