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Math question: How much are the original nickels, nickels and nickels in Sasha's piggy bank?
One fifth is equivalent to five points of 1, and four points are missing each time.

(73-33)/4= 10 times = 10*5=50.

Five points and two points are equivalent to five two points, and three points are missing at a time.

(100-73)/3=9 times and 2 points =9*5=45.

So100-50-45 at 5 o'clock = 5.

33 nickels, 33*5= 165 cents = 1.65 yuan.