Leave your answer to the riddle in the comments section.
In the picture you will see a football, basketball and a volley ball represent certain numbers.
You can write the equations by substituting;
Basketball by BB,
Football by FB &
Volleyball by VB.
So the equations would become;
- BB – BB – BB = -10
- BB – FB = -20
- FB – VB = 10
- VB – FB + BB = ?
Solving the first equation we get;
BB – BB – BB = -10
BB = 10
Putting this value in the second equation we get;
BB – FB = -20
10 – FB = -20
Therefore;
FB = 30
Putting this value in third equation we get;
FB – VB = 10
30 – VB = 10
Therefore;
VB = 30 – 10 = 20
Putting all the values in the fourth equation we can find the value of the missing number as;
VB – FB + BB = ?
20 – 30 + 10 = 0
Answer = 0
the 2nd statement is unnecessary, you don’t need to know the value of the Football or Volleyball
1st statement gives 0 – Basketball = -10
Basketball = 10
ignore 2nd statement
add 3rd statement to 4th statement > gives
Football – Volleyball + Volleyball – Football + Basketball = 10 + ?
reduce to Basketball = 10 + ?, thus ? must be Zero
0