Verified Answer :

Everest2017

Suppose the number is N
15 % N = 12
N 15 / 100  = 12
N = 12 100 / 15  = 80

35 % of N  = N 35 / 100 = 80 35 / 100 = 28

pepe11

12 is 15% of a number so this number is 12/15x100= 4/5.100 = 80
35% of 80 is 35/100x80 = 35/5x4 = 7x4 = 28

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