The cost of 8 dozen pencil and 2 dozen note book is 520 rupee If cost of 3 pencil and

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12 years agoHelpfull: Yes(3) No(4)
96P+24N= 520 ....... (1)

3P+4N= 60
multiplying by 72 ( as diff in number of P and N in first equation is 72)
216P+288N= 4320 .... (2)

Adding (1) and (2)
312P+312N= 4840
P+N= 4840/312= 15.51 ......... approx Rs. 15.5
12 years agoHelpfull: Yes(3) No(2)
@ sonam
the puzzle is already solved as per the site norms
12 years agoHelpfull: Yes(2) No(4)
THE ANSWER IS 15.51
EXPLANATION:

8X+2Y=520.....(1)

(3/12)X+(4/12)Y=60.....(2)

BY SUBSTITUTING EQN (1) &(2) WE GET X=24.61,Y=161.53,HERE X&Y REPRESENTS COST OF PENCIL IN DOZEN AND NOTEBOOK IN DOZEN,HENCE COST OF 1PEN IS 2.05 AND COST OF 1NOTEBOOK IS 13.46,THEREFORE SUM OF COST OF 1PENCIL AND 1NOTEBOOK IS 15.51
12 years agoHelpfull: Yes(1) No(1)
Let x & y are the cost of 1 pencil and 1 note book
According to the problem,
96x+24y=520---(i) [since, 1 dozen=12 qty.]
3x+4y=60-----(ii)
By solving these equations we get:
x=2.05
y=13.46
hence,x+y=15.5 ans.

proof:
------
putting the value of x & y on L.H.S of any equation suppose in equation-(ii)
L.H.S=3x+4y=3(2.05)+4(13.46)=59.99=60(apx)=R.H.S proved.
12 years agoHelpfull: Yes(1) No(0)
Where is the solution by Chaitanya ?

I could not find it here or in today's puzzle !
12 years agoHelpfull: Yes(0) No(1)

The cost of 8 dozen pencil and 2 dozen note book is 520 rupee. If cost of 3 pencil and 4 note book is 60 rupee, then sum of the cost of 1 pencil and 1 note book will be (in rupee)