Discussion
Concrete gains roughly 70 per cent of its 28-day strength by 7 days. If the 28-day strength is 40 megapascals, what is the approximate 7-day figure?
Answer: A
Seventy per cent of 40 is 28 megapascals. Proportions of this kind are used on site to judge whether a pour is developing strength as expected before the full result is available. Site decisions often cannot wait the full twenty-eight days.
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