Level - II
1. 5 pencils and 7pens together cost Rs. 50 whereas 7 pencils and 5 pens together cost Rs. 46. Find the
cost of one pencil and that of one pen.
Answers
Answered by
2
Let pencil be x and let pen be y
5x + 7y = 50
7x + 5y = 46
multiply first equation by 7
35x + 49y = 350
multiply second equation by 5
35x + 25y = 230
solving them we get 24y = 120
which gives y is 5 rupees substituting
in second equation we get x is
3 rupees...
this is ur ans...
hope its helpful to u...
Answered by
41
Answer:-
Cost of 1 pencil
Cost of 1 pen
• Given:-
Cost of 5 pencils and 7 pens = Rs. 50
Cost of 7 pencils and 5 pens = Rs. 46
• To Find:-
Cost of 1 pencil and 1 pen = ?
• Solution:-
Let the price of pencil be 'x' and the price of pen be 'y'.
According to the question:-
→
and
→
Multiplying eqn[i] by 5:-
→
→
Multiplying eqn [ii] by 7:-
→
→
Subtracting equation [iii] from [iv]:-
→
→
→
→
→
Substituting value of x in [eqn.i]:-
→
→
→
→
→
→
→
Therefore,
The cost of 1 pencil is Rs. 3
The cost of 1 pen is Rs. 5
Vamprixussa:
Perfect !
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