Why the nib of a pen is split?

Many buys 15 sets of pens and ball pens for ditributing to his friends on his birthday.If the cost of a pen is Rs.12 and that of a ball pen is Rs.8.how much does he spend on these?

If the S.P. of 5 pens is equal to C.P. of 4 pen then % age of loss incured is

Solve it graphically Shruti and Swati each have certain number of pens. Shruti says to Swati, “If you give me 10 of your pens, I will have twice the number of pens left with you. Swati replies, ‘‘If you give me 10 of your pens, I will have the same number of pens as left with you. Find the number of pens with Shruti and Swati separately.

What is the role of the split ring in an electric motor?

In how many ways the number 18900 can be split in two factors which are relatively prime or co prime