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80/100*20=16 you divide the # ur looking for by 100 and multiply it by the %age you want.
x=8 12x-16=80 add 16 to both sides of the equation 12x=96 divide both sides of equation by 12 x=8
96:80(divide both sides by 16)6:5
N equals 20. You would take 5 and multiply it by 16, and then you get 80. Take 80 and then divide by 4, and then you get 20. Here is what the equation would look like. 5x(16)=4n 80= 4n Then divide each side by a four. N=20. There you go.
The top one is 9 and the bottom one is 16.Just divide by 5 then you get your answer.