What? Are you sure this is worded correctly?

Number Theory Level 1

I have ten coins totaling forty cents. Two of them are not dimes. How many pennies do I have?

Details and assumptions

  • Pennies are worth one cent, nickels are worth five cents, dimes are worth ten cents, and quarters are worth twenty-five cents.

  • These are the only type of coins that may be used.


The answer is 5.

Finn Hulse by Finn Hulse , 21, USA

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2 solutions

Michael Mendrin
Mar 29, 2014

I think this is one of those tricky-worded questions that Calvin Lin suggests that we avoid posting, because it confuses people like me.

6 Helpful 0 Interesting 0 Brilliant 0 Confused
Finn Hulse
Mar 29, 2014

Notice that I said two of them are not dimes! That doesn't mean the same thing as there are not two dimes! In fact, there ARE two dimes, three nickels, and five pennies, thus 5 \boxed{5} is the answer! The problem is simple once you know that! :D

6 Helpful 0 Interesting 0 Brilliant 0 Confused

I feel ashamed, Didn't pay attention to that.

Mardokay Mosazghi - 7 years, 2 months ago

Cheers I followed the same reasoning

Ashtik Mahapatra - 7 years, 2 months ago

Yep!

Robert Fritz - 7 years, 2 months ago

two dimes can also be taken as 5 nickels thus , there are 5 pennies

basharrat khalid - 7 years ago

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