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= 48 : 2
= 24
DEF = (12 x 6) : 2
= 72 : 2
= 36
PQR = (16 x 4) : 2
= 64 : 2
= 32
STU = [(4 x 8) : 2] - [(4 x 3) : 2]
= (32 : 2) - (12 : 2)
= 16 - 6
= 10