Chris is 11 5/6 years old. Marian is 1 1/3 years younger than Chris and Jane is 1 1/4 years younger than Marian. How old is Jane
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To express a decimal number (with a finite decimal expression) in a fraction, you work like this: the numerator is the number without decimale separator (you simply pretend it's not there), while the denominator will be , where n is the number of digits after the decimal separator.
So, in your case, the number without decimal separator is 53, and you have two digits after the decimal separator, so the fraction will be
which is irreducible.