<PRE><B>Question 1017070</B>
g+s = 60 subtract s from both sides: g= 60-s
g+10 = s-15+5 substitute for g:
60-s+10 = s-15+5
70-s = s-20 Add 20 and s, both sides
90 = 2s Divide both sides by 2:
45 = s so this is the age of the silver coin, and the gold:
60-45= 15 is the age of the gold coin
J


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