Which number should replace the question mark?

FUNNY MATH: Which number should replace the question mark?
Category: 
Correct Answers: 
3
Points: 
10

Calculate the number 224

NUMBERMANIA: Calculate the number 224 using numbers [1, 7, 6, 1, 24, 729] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Category: 
Correct Answers: 
0
Points: 
10

Calculate the number 690

NUMBERMANIA: Calculate the number 690 using numbers [7, 8, 4, 5, 10, 100] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Category: 
Correct Answers: 
10
Points: 
3

What a winning combination?

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
Category: 
Correct Answers: 
7
Points: 
4

What is abcd?

Author: Nebojsa Jevtovic
Category: 
Correct Answers: 
39
Points: 
1
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