Explanation:
40 button
1/4×40=10 white
1/5×40=8 grey
4 orange
Total=22
Then,subtract
40-22
=18 black buttons
Answer:
19 Black Buttons
1/4 of 40= 10
1/5 of 40= 8
10+8=18
18+4=21
So there are 21 white grey and orange.
The rest are black so 40-21=19
So 19 black buttons
Hope this helps
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