Resham purchased a packet of 18 pens for Rs 56 and another packet of 8 pens for Rs 45 . Which packet was costlier and why??

The second packet.

Step-by-step explanation:

First Packet:

Cost of 18 pens = Rs 56

Cost of 1 pen = Rs 56 ÷ 18 = Rs 3.11 (rounded off to 2 decimal places)

Second Packet:

Cost of 8 pens = Rs 45

Cost of 1 pen = Rs 45 ÷ 8 = Rs 5.63 (rounded off to 2 decimal places)

Thus, the second packet is costlier because the cost of 1 pen in the second packet (Rs 5.63) is more than the cost of 1 pen in the first packet. (Rs 3.11)

The packet with 8 pens for Rs 45 is costlier.

Step-by-step explanation:

The unit rate of the first packet is 56 to 18, which can be simplified to the unit rate of $3.11 per single pen. Using the same process, the unit rate of the second packet is $5.63 per single pen.

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solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.