Question

plas this is question

Answer 1

20-12=8 which explains your answer

Answer 2

(i) let x be incorrect
$12 \times 3 - x \times 2 = 20 \\ 36 - 2x = 20 \\ - 2x = - 16 \\ x = 8$
(ii). let x be incorrect
$7 \times 3 - x \times 2 = - 5 \\ 21 - 2x = - 5 \\ - 2x = - 26 \\ x = 13$