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Answer:
total length of shleve is 3.05 cm.
Step-by-step explanation:
lenght of one piece is 1 ¼ cm ie 5/4 cm
lenght of another piece is 1 4/5 cm ie 9/5 cm
total lenght of shelve = 5/4 + 9/4 cm
= (25 + 36) / 20 cm
= 61/20 cm
total length of shelve is 3.05 cm
b) Since we have added two blocks then if we subtract our answer by with any one of the two blocks length we should get back either
5/4 and 9/5 as the length.
ie 3.05 - 5/4 = 9/5
and if we do , 3.05 - 9/5 = 5/4
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