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(1/2xA) = 450
A = 450 x 2
A= 900
(1/2 X n)-25 = 25x17
1/2n-25 = 25 X17
1/2 n = 25X17+25
1/2n = 425 + 25
1/2 n = 450
n = 450 : 1/2
n = 900