15 pennies = 15 cents
10 nickels = 10*5 cents = 50 cents
The ratio is thus 15:50, or in lowest terms 3:10. Expressed as a fraction, that's 3/10; as a percent it's 30%.
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Ten nickels, five pennies
1 dime 2 nickels 1 nickel, 5 pennies 10 pennies
1 Mole of pennies. Hands down. In fact, it's painfully obvious. The next highest contestant is Ten-thousand million nickels which is 12044283000000 times smaller than a mole of pennies. 1 billion dimes = 100 million dollars = $100000000 10 billion (ten-thousand million) nickels = 500 million dollars = $500000000 1 million dollars = >.> = $1000000 1 mole (6.0221415e23) of pennies = Not even this much money in the world. But if you are curious, 1 mole of pennies is worth $6022141500000000000000.
Fifteen ten-thousandths as a decimal is 0.0015
Ten thousand million nickels is 10,000,000,000 nickels (10 billion) with a value of $500,000,000.00 or 500 million dollars.