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This is subtraction of fractions.

Hence

9/16 - 9/20 =>

[9(20) - 9(16)] / (16 x 20)

[180 - 144] / 320

[36] /320

Cancel down by '4'

9/80 The answer ; this will not reduce any further.

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lenpollock

Lvl 16
2mo ago

What else can I help you with?