Ramesh had 20 pencils, Sheelu had 50 pencils and Jamaal had 80 pencils. After 4 months, Ramesh used up 10 pencils, Sheelu used up 25 pencils and Jamaal used up 40 pencils. What fraction did each use up? Check if each has used up an equal fraction

Raj had 1 dozen copies,Jyoti had 2 dozen copies,James had 2(1)/(3) dozen copies and Smriti had 2(2)/(3) dozen copies.After one month,Raj used up 3 copies,Jyoti used up (1)/(2) dozen copies James copies.What fraction did each have after one month? Check,if each has an equal fraction of copies.

Let us consider Example 2 in Section 3.3, i.e., the cost of 2 pencils and 3 erasers is Rs 9 and the cost of 4 pencils and 6 erasers is Rs 18 . Find the cost of each pencil and each eraser.

Divya has some colour pencils. She measures the length of some pencils using a scale in cm and of others using a scale in mm. The given table shows the length of various colour pencils. The colour of pencils with the greatest and least length are respectively

A pencil earser loses tiny pieces of rubber each time you use it. Why does this happen ?

Three shopkeepers A , B a n d C go to a store to buy stationary. A purchases 12 dozen notebooks, 5 dozen pens and 6 dozen pencils. B purchases 10 dozen notebooks, 6 dozen pens and 7 dozen pencils. C purchases 11 dozen notebooks, 13 dozen pens and 8 dozen pencils. A notebook costs 40 paise, a pen costs Rs. 1.25 and a pencil costs 35 paise. Use matrix multiplication to calculate each individuals bill.

The cost of 4 dozen pencils, 3 dozen pens and 2 dozen erasers is Rs. 60. The cost of 2 dozen pencils, 4 dozen pens and 6 dozen erasers is Rs. 90 whereas the cost of 6 dozen pencils, 2 dozen pens and 3 dozen erasers is Rs. 70. Find the cost of each item per dozen by using matrices.

An organism uses 20 amino acids while its DNA is made up of 6 types of nitrogenous bases. What would be the minimum size of a codon ?