Q. 474.5( 11 Votes )
A lending library has a fixed charge for the first three days and an additional charge for each day thereafter. Mona paid Rs. 27 for a book kept for 7 days, while Tanvy paid Rs. 21 for the book she kept for 5 days. Find the fixed charge and the charge for each extra day.
Let the fixed charge and the charge for each extra day be x and y respectively.
According to question -
x + 4y = 27
x + 2y = 21
Subtracting equation (2) from (1), we get -
y = 3
Substituting the value of y in (2), we get -
x = 15
Thus, Fixed Charge = 15 and the charge for each extra day = Rs. 3 per day.
Rate this question :
Solve the following pair of linear equation by cross - multiplication method:
x + 4y + 9 = 0
5x – 1 = 3yKC Sinha - Mathematics
Solve each of the following systems of equations by using the method of cross multiplication:
2x + y = 35, 3x + 4y = 65.RS Aggarwal - Mathematics
If 2x – 3y = 7 and (a + b) x – (a + b – 3) y = 4a + b represent coincident lines, then a and b satisfy the equationRD Sharma - Mathematics
A plane left 30 minutes later than the scheduled time and in order to reach the destination 1500 km away in time, it has to increase the speed by 250 km/hr from the usual speed. Find its usual speed.KC Sinha - Mathematics