Lola has $60 after the first month.
After 5 months Lola will save enough money to buy the bike.
Let, Lola will be able to buy the bike after x months.
Therefore, $50 + x × $10 = $100
⇒ x × $10 = $(100 - 50)
⇒ x × $10 = $50
⇒ x = $50 / $10
⇒ x = 5
Hence, after 5 months, Lola will save enough money to buy the bike.
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