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2 dam a m =
1 dam ---- 10 m
2 dam ---- x
x = 20 m
5 dm a m
10 dm ---- 1 m
5 dm ----- x
x = 0.5 m
rollo total = 20 m + 4 + 0.5 m = 24.5 m
venden:
8 dm a m
10 dm ---- 1 m
8 dm ----- x
x = 0.8 m
vendido = 7 m + 0.8 m = 7.8 m
quedan en el rollo:
24.5 m - 7.8 m = 16.7 m
1 m ------ 8.50 $
16.7 m ------ x
x = 141.95 $