To find 14 percent of 15.5 ounces, multiply 15.5 by 0.14 - giving us 2.17 ounces.
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It is a 12.5% decrease.
.35x+.40*14=0.37(x+14) .35x=.37x-5.6+5.18 .35x=.37x-.42 -.02x=.42 x=21 check 21*.35+14*.4=7.35+5.6=12.95 12.95/(14+21)=.37 so you would need 21 ounces of 0.35 mixed in with 14 ounces of 40 % to get a 37% solution of which you would have 35 ounces
4% of 155 = 4% * 155 = 0.04 * 155 = 6.2
31% of 155 = 31% * 155 = 0.31 * 155 = 48.05
31.2*155=31