Answer :
Answer:
₹66
Step-by-step explanation:
let the cost of 1 pen be ₹x and 1 notebook ₹y
2x+3y=66------(i)
3x+2y=54------(ii)
multiplying (i) by 3 and (ii) by 2,we get
6x+9y=198-----(iii)
6x+4y=108-----(iv)
(iii)-(iv), we get
6x+9y-6x-4y=198-108
=>5y=90
=>y=90/5
therefore, y=18
from (i)
2x+3y=66
2x=66-3y
x=66-3y/2
therefore x=66-54/2
x=12/2=6
since,
1 pen costs=₹6 and 1 notebook costs=₹18
therefore,
5 pen costs=₹30 and 2 notebook costs=₹36
therefore,
total cost=₹66
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Answer:
let the cost of pen=x
and the cost of notebook=y
according to the question:
2x+3y=66------------1 equation
3x+2y=54------------2 equation
4x+6y=132(after multiply by 2)
9x+6y=162(after multiply by 3)
= -5x=-30
x=6
put the value of x in equation 2
3x+2y=54
3×6+2y=54
18+2y=54
2y=54-18
y=36/2
y=18
the cost of 5pens=5x=5×6=30
the cost of 2pens=2y=2×18=36
total cost=30+36=66