(4) Find x if 25% x 16x +1 = 6400
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25/100*16x+1=6400
25/100*16x =6400-1
25/100*16x =6399
25*16x = 6399*100
25*16x =639900
16x = 639900 - 25
16x =639875
x = 639875/16
x= 39992.1875 =ans.
I holp help you
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