If 80 is 70% then full marks is 111.11... (repeating). A somewhat unlikely value.
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72/80 x 100 = 90 % 100 - 90 = 10 % which is the decrease from 80 to 72
He got 63/72.
Twin 38" x 75" Full/Double/Regular 53" x 75" Queen 60' x 80" King 76" x 80" Cal. King 72" x 84"
The following mattress sizes are in inches, width x length: Crib 28 x 52 Twin 39 x 75 Twin XL 39 x 80 Full 54 x 75 Queen 60 x 80 King 76 x 80 California King 72 x 84
90 is 100 percent. 90/100 = 0.9 is 1 percent. 72 / 0.9 = 80 72 is 80 percent of 90.