Hey there! :)
Assuming that we're speaking about musical notes, then we know that a whole note = 4 beats
So, we know that :
** whole note = 4 beats **
** half note = 2 beats **
**quarter note = 1 beat **
So, we are given the equation :
whole note - 1 half note - 2 quarter notes.
Plug in what we know.
(4) - (2) - (1) - (1)
Simplify.
2 - 1 - 1
1 - 1
0
So, our answer is 0 beats!
~hope this helped~