Question

i)There are 20 girls and 15 boys in a class. (a) What is the ratio of number of girls to the number of boys? (b) What is the ratio of number of girls to the total number of students in the class? ii) Cost of a dozen pens is Rs.180 and cost of 8 ball pens is Rs.56. Find the ratio of the cost of a pen to the cost of a ball pen. *​

Answer 1

i)

(a): 20:15=4:3

(b):20:35=4:7

ii)

Cost of dozen pens(12)=180

Cost of one pen=180÷12

=15

Cost of 8 ball pens=56

Cost of 1 ball pen=56÷8

=7

The ratio of cost of a pen to the cost of a ball pen= 15:7

Hope it helps you

Please mark it as a brainliest answer.....

Answer 2

Hi mate ,

i. a) Number of girls = 20

Number of boys = 15

When we simplify 20/15 , we get 4/3.

Therefore , the ratio of number of girls to the number of boys = 4:3

b) Total number of students in the class = 20+15 = 35

When we simplify 15/35 , we get 3/7

Therefore , ratio of number of girls to the total number of students in the class = 3:7

ii. a) The cost of a dozen pen = ₹180

Therefore , the cost of one pen = 180 ÷ 12 = ₹15

The cost of 8 ball pens = ₹56

Therefore , the cost of one ball pen = 56 ÷ 8 = ₹7

15/7 is already in it's simplified form.

Therefore , the ratio of the cost of one pen to the cost of one ball pen = 15:7