That depends on the answer required.
If it's 11 then each digit can be made from 3 sticks
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9 + 11 = 20... 19 - 4 = 15... 15 x 20 = 300... 300 - 6 = 294 !
5 + 6 = 11 6 + 5 = 11 11 - 6 = 5 11 - 5 = 6
11 + (19 + 6) = 36(11 + 19) + 6 = 36So they are both equal. The brackets make no difference in this case.
Yes, it is possible to make 25 cents with 17 coins. You can achieve this by using 6 quarters (6 x 25 cents = 150 cents) and 11 pennies (11 x 1 cent = 11 cents). In total, you would have 17 coins with a combined value of 25 cents.
11 is a prime number and has no prime factors other than itself.