Answer:
28
Explanation:
If 1/6 of the markers are red (8) then 8 * 6 = 48 meaning Oona has 48 markers, 8 of them being red.
1/4 of 48 is 12, so 12 yellow markers
If the rest are blue, then 8+12 = 20 and 48-20=28
There are 28 blue markers
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