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Solution D
45---------32
36
9 4
9x4=36
36-32=4
45-46= 9
(16)=D (17)=B (18)=B (19)=D (20)=E

Solution A
4 + 2 = 14 is ( 4x2 +(4+2))

(1)=B (2)=C (3)=B (4)=A (5)= D

Solution C
M=6, MxK=24, K=4, MxN=30, N=5, LxN =15, L=3
(11)=A, (12)=B (13)=C (14)=C (15)=D


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