3. An alloy of gold and copper weighing 100 gm contains 97 gm of gold. How much gold should be added to the alloy to increase the percentage of gold to 98
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(97+x)/(100+x)=.98
97+x=.98*(100+x)
97+x=98+.98x
.02x=1
2x=100
x=50
check
97+50/150=147/150=,98
ok
(97+x)/(100+x)=.98
97+x=.98*(100+x)
97+x=98+.98x
.02x=1
2x=100
x=50
check
97+50/150=147/150=,98
ok
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