Question

when a person calculated his expenses from sunday to thursday,he found the average expenditure to be 400 rupeesper day including friday the average increased to 430 rupees perday how much did he spent on friday? in cluding saturday the average decreased to390 perday how much did he spend on saturday​

Answer 1

Hey Dear,

◆ Answer -

Expenses on Friday = 580 ₹

Expenses on Saturday = 150 ₹

● Explanation -

Let x and y be amounts spent by the person on Fruday and Saturday.

Average till Friday,

Average = (5×400 + x) / 6

430 = (2000 + x) / 6

x = 430×6 - 2000

x = 2580 - 2000

x = 580 Rs

Average till Saturday,

Average = (5×400 + x + y) / 7

390 = (2000 + 580 + y) / 7

y = 390×7 - 2000 - 580

y = 150 Rs

Therefore, we can say that the person spent 580 Rs on Friday and 150 Rs on Saturday.

Best luck...