Q6- Sequence Puzzle

Which pair of letters comes next in this sequence:

on et wo th re ef ou

Q5-Speedy Sums

A salesman drives from Amsterdam to The Hague. The first half of the distance of his journey, he drives at a constant speed of 80 km/h. The second half of the distance of his journey, he drives at a constant speed of 120 km/h.

The Question: What is the salesman's average speed for the complete journey?

A Hint : The solution is not 100 km/h!

Q4- Plus Puzzle

The six puzzle pieces shown above can be combined into a symmetrical plus sign.  The Question: How can this be done?   

Q3- Make a Hundred

With the digits 1 up to 9 you must make 100, using the following rules:

•      Each digit must be used exactly once.
•      The only allowed operation is addition.
•      Two single digits may be combined to form a number (so, for example, 2 and 4 may be combined to 24 or 42).
•      Two single digits may be combined to form a fraction (so, for example, 2 and 4 may be combined to 2/4 or 4/2).

   
The Question:- How can this be done?

Q2-Play with numbers

With the digits 1, 4, 5 and 6 you must make 24, using the following rules:

•      Each digit must be used exactly once.
•      The allowed operations are: addition, substraction, multiplication and division.
•      Digits may not be concatenated (so, for example, it is not allowed to use 1 and 4 as 14).
•      Brackets are allowed.

   
The Question:- Give the two solutions to this problem.

Q1-Fill the Blanks

Given the following sentences:- The number of times the digit 0 appears in this puzzle is _____. The number of times the digit 1 appears in this puzzle is _____. The number of times the digit 2 appears in this puzzle is _____. The number of times the digit 3 appears in this puzzle is _____. The number of times the digit 4 appears in this puzzle is _____. The number of times the digit 5 appears in this puzzle is _____. The number of times the digit 6 appears in this puzzle is _____. The number of times the digit 7 appears in this puzzle is _____. The number of times the digit 8 appears in this puzzle is _____. The number of times the digit 9 appears in this puzzle is _____. Complete these sentences with digits until they are all true.     The Question:- Which two solutions are possible?