lf 'x' means '-', '-' means '+', '/' means 'x', and '+' means '÷', which of the following is correct?
A20 + 4-2 × 5 = 10
B15 - 3 + 6/2 = 12
C48 / 8 + 3-5 × 1 = 15
D10 × 2-4+8/2=9
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