Ruben bought six new books for his collection. This increased his collection by 12%. How many books did he have before his purch
ases?
1 answer:
<span> 20. Let x represent the amount of books he had:
x + 6 = 1.12x
Subtract x from both sides:
6 = 0.12x
Divide both sides by 0.12; x = 50
</span>
<span>28. $6 + 0.025*$6 = $6 + $0.15 = $6.15 </span>
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