80/4 = 20
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1/80
(80) / (1/4) = 320
Let the fourth number be x. We have: (80 + x)/4 = 88 (multiply both sides by 4) 80 + x = 352 (subtract 88 to both sides) x = 272 Thus, the fourth number is 272.
1.2375
Not sure what you are asking. 20 is 1/4 (25%) of 80 and 1/4 of 20 is 5.