Lastkingz209Life1414 Lastkingz209Life1414
  • 14-07-2016
  • Mathematics
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An alloy of tin is 15% tin and weighs 20 pounds. How many pounds of tin are in the alloy?

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Аноним Аноним
  • 14-07-2016
percentage of alloy 1=15%
quantity of  alloy 1 =20 pounds
percentage of alloy 2=10%
quantity of alloy 2 =x pounds
total alloy =12
quantity of total alloy =(20+x)pounds

15*20+10*x=12(20+x)
300+10x =240+12x
10x-12x=240-300
-2x= -60
/-2
x=30
So the quantity of tin will be 30 pounds for 10% tin

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