Question

72% of 25 students are interested in mathematics. How many are not interested in mathematics.

Answer 1

Answer:

• total 100% =25
• interested =72%
• not interested =100% - 72% =28%
• not interested students = 28% * 25

= 28/100 * 25

=28/4

=7

Answer 2

Topic:

Comparing Quantities

Question:

72% of 25 students are interested in mathematics. How many are not interested in mathematics.

Solution:

No. of Students interested in mathematics

➞ 72% of 25

➞72/100 × 25

➞18

No. of Students not interested in mathematics

➞ 25 -18

➞7

Explore:

Ratio-

• Comparing by division is called ratio.

• It has no unit.

• It is denoted by ( : ) symbol.

• For example- 4:6 , 7:4 , 9:3