Question

A pen costs 13 rupees and a note book costs 35 rupees.let m be the maximum number of items that can be bought for 1000 rupees and n be the minimum number of items that can be bought for the same amount ,then m+n is
a)76
b)88
c)96
d)98

Answer 1

@sumanta

Answer 2

will give a medal

Answer 3

@Michele_Laino

Answer 4

@sreekar369 I have found!, it is m+n=76

Answer 5

Please you have to solve this equation:
\[13*x+35*y=1000\]
where x is the number of pens, and y is the number of notebook.
Now, I rewrite the above equation in the new form:
\[35*y=1000-13*x\]
that equation, tells us that the difference between 1000 and 35*x must be divisible for 35, so I try to set x=5:
substituting, we have:
\[35*y=1000-55=945\] from which I get y945/35=27, finally I can write x+y=27+5=32=n.
Next step is to set x=20, so we have to solve the subsequent equation:
\[35*y=1000-260=840\]
from which I get y= 840/35=24, so x+y=20+24=44=m.
FInally I have m+n=32+44=76.

Answer 6

thqs

Answer 7

thanks!