please answer this question above
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Step-by-step explanation:
5. 6 9/40 = 249/40
249/40 x 100 = 24900/4000
(24900/4000)/40
622.5/100
6.225
6. 252/63 = 4
7 x 4 = a
a = 21
21/21 = 1
252/21 = b
b = 12
(21+12) x (21-12)
33 x 9
297
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