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

Neelam had 15 pencils. She gave 7 to her friend. What fraction of the total pencil did she give?

Simi used up 750 millilitre paint out of a bucket which contained 5 litre of paint. What fraction of paint did Simi use ?

In an Art class, the teacher gives 3 pencils to each student and has 5 pencils left over. a. Find the rule for the number of pencils the teacher had at the beginning of the class. b. If the number of students in the class is 12, find the number of pencils the teacher had at the beginning of the class.

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.

Shikha had 42 pencils with her. She starts giving out 5 at a time to her classmates. How many pencils are left with her after she has distributed 5 pencils each to seven of her classmates?

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.

Give reason : (a) A frying pan is made up of steel but its handle is made up of wood. (b) Graphite is used to make lead of the pencils. (c) Argon is filled in electric bulbs.

In the 10^(th) grade of Brooklyn Public School, the ratio of the number of boys to the number of girls was 3: 5 . Among the students , some had taken up literature as a specialzation while the rest had taken up science. The ratio of the number of literature students to science students was 5: 7 . If it is known that one - thrid the number of boys had taken up science as a specialization , what fraction of the girls had literature as their specialization ?

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 ?

Name the geometrical instrument that has two legs, one with a pointed end and the other with a pencil/lead used for making geometrical constructions.