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420 35 = 5 x 7 12 = 22 x 3 lcm = 22 x 3 x 5 x 7 = 420
20% X=22 ( 20/100)X=22 X/5=22 x=110 The number is 110
5 and 11 are prime. The others are not (3 x 4 =12, 3 x 5 =15, 2 x 11 =22)
2 x 2 x 5 x 5 = 100