Question

6X4=12
7X5=20 8X5=21 5X7= ?

Answer 1

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Here is your answer

$6 \times 4 = 12 \\ 7 \times 5 = 20 \\ 8 \times 5 = 21 \\ \\ now \\ 5 \times 7 = 20 \\ as \: 7 \times 5 = 5 \times 7$
Therefore
5×7 = 20

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