Fifth grade math! ! !

175÷225=7/9, leaving 1-7/9 = 2/9.

3/ 15 +2/7= 17/35, the rest are1-17/35 =18/35.

Cut six squares with a side length of 0.4m into equal squares as large as possible, without wasting iron pieces, that is, the maximum common divisor is 0.41.2 ÷ 0.4 = 30.8 ÷ 4 = 23× 2 = 6.

Finding the least common multiple of 3 and 4 is 12 days, so it is 12 days later.

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