SPEED MATH - 17th september

1) If (a,b) are two integers in such a way that a³ = b², then which of the following sets of numbers (a,b) will satisfy this equation

• 3,6

• 6, 15

• 9, 27

•         None of these

2) If the difference between squares of any two consecutive numbers is 49, then the consecutive numbers are

• 22, 23

• 23, 24

• 24, 25

• 25, 26

3) If a 20 meter tape is folded in the shape of a rectangle such that the area of the rectangle is 100 sq.mts, if the length of the rectangle is L, which of the following equations are true

• L² – 20L  = 100

• L² – 10L = 100

• 20L – L² = 100

• 10L  - L² = 100

4) In an animal cells get regenerated by multiplying, assuming initially there are 50 cells and they get doubled after every 2ms, What will be the total number of cells that will be present after 10ms.

• 800

• 1200

• 1600

• 2000

The number of factors of 36 is

• 6

• 7

• 8

• 9

which of the following numbers is largest

• 3/5

• 5/7

• 7/9

• 9/11

The one’s digit of the cube of 23 is

• 6

• 7

• 3

• 9

Which of the following is the square of an odd number

• 256

• 361

• 144

• 400

The sum of successive odd numbers 1, 3, 5, 7, 9, 11, 13 and 15 is

• 81

• 64

• 49

• 36

The human body has about 100 billion cells. this number can be written in exponential form as

• 10⁹

• 10¹⁰

• 10¹¹

•  10¹²