# Math Puzzle 4

This math puzzle 4 is on speed,distance,square-root,factors etc.

1)By how much per cent must a motorist increase his speed in order to reduce by 20%, the time taken to cover a certain distance?
(1) 20    (2) 30    (3) 25    (4) 35

2) The square root of 0.0081 is:
(1) 0.09    (2) 0.9    (3) 0.91    (4) 0.009

3) Choose correct option in the place of question mark:
 2 4 6 18 ? 30 162 196 150 1458 1372 750

(1) 16   (2) 28   (3) 49   (4) 54

4) 10 years ago father was seven times as old as his son. 2 years hence twice his age will be equal to five times his son. What is the present age of son?
(1) 15 years    (2) 14 years    (3) 13 years   (4) 12 years

5) The factors of x2 + xy − 2xyz − 2z are:
(1) (x − y)( x + 2z)   (2) (x + y)( x − 2z)   (3) (x − y)( x − 2z)
(4) (x + y)( x + 2z)

6) Evaluation of 83 × 83 × 8-5 is
(1) 1    (2) 0    (3) 8    (4) None of these

7) The simplest form of 1.5 : 2.5 is
(1) 6 : 10    (2) 15 : 25    (3) 0.75 : 1.25    (4) 3 : 5

8) Under a scheme of investment, the rate of interest is 4% and the interest is compounded three monthly. What will be the amount if a man invests $2000 for 1 year under this scheme? (1)$ 2125.54   (2) $2081.21 (3)$ 2100.25   (4) \$ 2060

9)10-2 means:
(1) Milli (2) Centi (3) Micro (4) Deci

10) The simplest form of 12 : 18 is
(1) 6 : 9    (2) 12 : 9    (3) 9 : 6   (4) 2 : 3

Math puzzle 4

From Math puzzle- 4 to Math Teasers

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