If J denotes addition, G denotes subtraction, M denotes multiplication, and B denotes division, then which of the following equations will NOT be correct?

Correct option is D

Decode each equation using the following substitutions:
· J denotes addition (+),
· G denotes subtraction (−),
· M denotes multiplication (×),
· B denotes division (÷).
(a) 8M2G6B3J7 = 21
M = multiplication (×), G = subtraction (−), B = division (÷), J = addition (+)
8×2−6÷3+7
= 8×2−2+7
= 16−2+7
= 23 −2
= 21 (Correct)
(b) 4G16B2J6M8 = 26
M = multiplication (×), G = subtraction (−), B = division (÷), J = addition (+)
4−16÷2+6×5
= 4−8+6×5
= 4−8+30
= 34 – 8
= 26 (Correct)
(c) 6M5J4B2G10 = 22
M = multiplication (×), J = addition (+), B = division (÷), G = subtraction (−)
6×5+4÷2−10
=6×5+2−10
=30+2−10
=32 – 10
=22 (Correct)
(d) 6B2M8G10J4 = 20
B = division (÷), M = multiplication (×), G = subtraction (−), J = addition (+)
6÷2×8−10+4
=3×8−10+4
=24−10+4
=28 – 10
18 ≠ 20 (Incorrect)
Correct answer is (d) 6B2M8G10J4 =20