A secret can be told to only 3 persons in 3 minutes. Each person in turn tells 3 other persons in the next 3 minutes and the processes continues accordingly. In 30 minutes how many persons can be told this secret in this way ?

Correct Answer: 13

Explanation:

Given,

 5sinx + 12cosx ? -r 

? 13 5 13 sin x + 12 13 cos x ? - rcosx) ? -r 

5 13= cosA => sinA = 12 13

 

=> 13(sinx cosA + sinA cosx) ? -r

 

=> 13(sin(x + A)) ? -r

 

we know that , -1 ? sin (angle) ? 1

 

=> 13sin (x + A) ? -13 ? r m i n = 13 

Correct Answer: 15

Explanation:

Using BODMAS Rule,

First solve division, mutiplication and Addition

So here 10/2 = 5

Then 2 x 5 =  10

Now, 5 + 10 = 15.

 

Hence, 5 + 2 x 10/2 = 15.

Correct Answer: 7/25

Explanation:

a b × b c = 4 5 × 15 16 = 3 4 = 16 - 9 16 + 9

 

= 7 25

Correct Answer: 1

Explanation:

50.003% of 99.8 ÷ 49.988 = ?

 

? ~= (50 x 100/100)/50

 

? ~= (50 x 100)/(100 x 50)

 

? ~= 1

Correct Answer: 2

Explanation:

Given Expression =  18800 470 ÷ 20 =  40 ÷ 20 = 2

Correct Answer: 150

Explanation:

Half of the cloth = 37.5/2
From 1 meter he will make 8 pieces
=> in 37.5/2 ---- ?

37.5/2 x 8

= 150.

Correct Answer: bL = -a

Explanation:

$$\begin{gathered} [ ( K - L ) 2 - K + L 2 ] 4 K = a b \\ K 2 + L 2 - 2 K L - K 2 + L 2 + 2 K L 4 K = a b \end{gathered}$$

 

=> - 4KL/4K = a/b

 

=> L = - a/b

 

=> bL = -a

Correct Answer: 16/3

Explanation:

64/12 = 16/3 in simplest form.

Correct Answer: 1.75

Explanation:

56/32 can be reduced as

 

56/32

= 28/16

= 14/8

= 7/4

= 1 3/4

= 1.75

 

Hence, simplified value of 56/32 =  3/4 = 1.75.

Correct Answer: 9

Explanation:

26 trees have 25 gaps between them,
Required distance (225/25) = 9