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Since the length of 1 block is 2/3m and the length that it has to be laid up to the end is 66 meters long then we can say that we have to divide the total length by the length of 1 block to get the number of blocks needed.------------------------In mathematical notation it would be:66m~÷\frac{2}{3}= (66×3)/2 \\ =198/2 \\ =99