two fifths of five sevenths

twofifths

if the yellow rod is 1, the red is two fifths

if the black rod is 1 the yellow is five sevenths

read straight from the rods: two fifths of five sevenths is two sevenths

the 5 is common to both and cancels out

(the 5 is the ‘denominator’ of the first and ‘numerator’ of the second fractions)

the ‘x’ is an operator, in this case called ‘of’

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