In the textbook of Mathematics the content
should be developed

• in the order of exercise

• in logical order

• in problematic order

• All of the above

When 73² is subtracted from the square of a number, the answer that is obtained is 5280. What is the number?

• 97

• 103

• 99

• 101

ind te value of $\sqrt{\frac{1.44 \times 0.81}{0.9 \times 3.6}}$ = ?

• 0.6

• 0.5

• 1

• 0.75

Which of the following numbers is divisible by both 4 and 9 ?

• 2368

• 2736

• 3954

• 3814

What should be added to 51234, to make it divisible by 9 ?

• 6

• 4

• 3

• 5

The ratio of the length to the breadth of a rectangle is 2 : 1. Its perimeter is 60 cm, find its area.

• 250sq cm

• 200 sq cm

• 300 sq cm

• 205 sq cm 

Find the square root of 1234567654321.

• 1121121

• 111111

• 1112111

• 1111111

On decreasing the radius of a sphere by 20%, by what per cent its volume will be decreased?

• 20

• 28.8

• 57.6

• 48.8

If the area of a circle is A, radius of circle is r and circumference ofit is C, the

• $\mathrm{rC} = 2\mathrm{A}$

• $\frac{\mathrm{C}}{\mathrm{A}} = \frac{{\displaystyle \mathrm{r}}}{2}$

• $\mathrm{AC} = \frac{{\mathrm{r}}^2}{4}$

• $\frac{\mathrm{A}}{\mathrm{r}} = \mathrm{C}$

A number when tripled and decreased by 15 we get the result as 120. Find the number

• 45

• 40

• 42

• 50