The correct answer is 21! Here is a solution :)
x + x + x = 30 So x = 10
10 + Y + Y = 18 So Y = 4
4 - Z = 2 So Z = 2
0,5 z + x * 0,5y = 21
The correct answer is 21! Here is a solution :)
x + x + x = 30 So x = 10
10 + Y + Y = 18 So Y = 4
4 - Z = 2 So Z = 2
0,5 z + x * 0,5y = 21
Correct but too late!