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- At the start, white is 16 more than red, as shown in "BEFORE".
- Since 22 whites were replaced with red, it is as if the white
  block of 22 was moved down and painted red.
- We are left with u whites in "AFTER".
- Looking at diagram, we see that initially we had u + 6 reds.
- So at the end we must have u + 6 + 22 = u + 28 reds.
- We are told that at the end, we have 3u reds (3 times as whites)
- So 3u = u + 28. Thus u = 28/2 = 14.
- Total number is 4u = 4 x 14 = 56.
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