x = 15 - N.
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10.515% of 70: put n over 70 equals 15 over 100n ----------15--- equals ---- then cross multiply n x 100 and 15 x 7070---------100which would be 100n and 1050then divide100n --------1050------ equals ------- n equals 10.5%100 -----------100
n X .15 = 9 9 / .15 = n 9 / .15 = 60
15 - n when n equals 9 = 6
n + (2 x 3) = 21 Therefore, n = 21 - (2 x 3) n = 15
27-12=15 -x-=+ 15/5=3 12- -3= +15 12+15=27 n= -3