Given number series is 12  9  13.5  30.3  ?  341.7

Here the pattern followed by the series is

12 

12 x 0.75 = 9

9 x 1.5 = 13.5

13.5 x 2.25 = 30.3

30.37 x 3 = 91.12

91.12 x 3.75 = 341.71

Hence, the missing number in the sequence is 91.12.

Quantity of alohol in the mixture = 40 x 5/8 = 25 lit

Quantity of water = 40 - 25 = 15 lit

According to question,

Required ratio = 20 - 40 x 20100 x 5815 - 40 x 20100 x 38 + 40 x 20100 = 2015 - 3 + 8 = 1 : 1

Let the number of days be 'p' 

As the work is same, we know that

M1 x D1 x H1 = M2 x D2 x H2

Where M = Men, D = Days, H = Hours per day 

Here M1 = 9, D1 = 15, H1 = 7 

M2 = 6, D2 = p, H2 = 9 

=> 9 x 15 x 7 = 6 x p x 9 

=> p = 35/2 = 17.5 days.

The ball with which Table Tennis is played is called Ping Pong Ball.

According to the International rules, the diameter of the ping pong ball must be not less than 39.5 millimeters and not greater than 40.5  millimeters having a mass of 2.7 grams.

Slavic languages, also called Slavonic languages, a subfamily of the Indo-European family of languages Eastern European ethnic group, commonly associated with Russia, the Baltic States, and other Eastern European countries. peoples of the lands of today's Eastern Europe and Russia have excited curiosity and beckoned visitors.

Key to these peoples and cultures are the Slavic languages:

1. Russian,

2. Ukrainian,

3. Polish,

4. Czech, and

5. Bosnian/Croatian/Serbian.

• Flemish is the language of many Belgians.
• Romanians are more Hungarian or Balkans-affiliated than Russian.
• Gaelic is the language of the Celts (Scotland/Ireland).

The Suez Canal in Egypt, is a 101 mile long canal that connects the Mediterranean Sea with the Gulf of Suez, a northern branch of the Red Sea. It was built in 1869 by Ferdinand de Lesseps.

Given 0.875 and 0.375

0.875 ::

After decimal point there are 3 digits 875

Now, mutiply and divide 0.875 with 1000

$$\begin{gathered} 0.875 x 10001000 = 8751000 \\ Now, this can be reduced to fraction 78 \\ Therefore, 0.875 as fraction = 78 \end{gathered}$$

Similarly,

0.375 :: 

After decimal point there are 3 digits 375

Now, mutiply and divide 0.375 with 1000

$$\begin{gathered} 0.375 x 10001000 = 3751000 \\ Now, this can be reduced to fraction 38 \\ Therefore, 0.375 as fraction = 38 \end{gathered}$$

The Riddle itself has the Answers.

What is a 4 letter word

Yet is written in 3 letters

Everything is written with 9 letters

Then with 4 letters

Rarely has 6 letters

Never is written in 5 letters.