54 + 4 = 58 58 – 6 = 52 52 + 4 = 56 56 – 6 = 50 50 + 4 = 54 54 – 6 = 48 48 + 4 = 52
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A civil contractor planned to build an over bridge of 3 km distance in 600 days. For this purpose, he employed 90 workers. After 200 days of work, it wa...
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