Mathematics, 10.03.2022 14:00 blackjack73

Mei Ling has 200 coins. 25% of these coins are $1 coins. She wants to increase the number of $1 coins to 40%. How many $1 coins must she collect?

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Mei Ling has 200 coins. 25% of these coins are $1 coins. She wants to increase the number of $1 coin...