Question

4 x 5 = 15
7x 2 = 12
2 x 8 = 8
20 x 10 = ??

Answer 1

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Answer is
In this situation, When 4 multiple to 5 it become 20 and then, subtract from next multiplied number i.e. 5, So it become 15.
So,
20 into 10 is equal to 200.
Then,
200 subtract with 10 is equal to 190.

Answer 2

we can see 4-1=3.
3×5=15
7-1=6×2=12
2-1=1×8=8
20-1=19×10=190