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Anonymous
X * 4 = 100divide both sides by 4X = 100/4 = 20
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um... 20 x 4 = 80..4 x 25 = 100
however, 20 x 5 = 100
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Four times.
Exactly four times
25, 4 • 25= 100.
5 x 20 = 100
99 + 9/9 = 100