Two math problems
1) The sum of twice a number and -6 is nine more than the opposite of that number. Find the number.
2) A collection of 27 coins, all nickels, and dimes worth $2.10. How many of each coin are there? The dime, in United States usage, is a ten-cent coin. In American usage, a nickel is a five-cent coin composed of 75% copper and 25% nickel.
2) A collection of 27 coins, all nickels, and dimes worth $2.10. How many of each coin are there? The dime, in United States usage, is a ten-cent coin. In American usage, a nickel is a five-cent coin composed of 75% copper and 25% nickel.
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