In favourable circumstrances a 15 cm concrete cube after 28 days, attains a maximum crushing strenth

- 1
  
  $100 k g / c m^{2}$
- 2
  
  $200 k g / c m^{2}$
- 3
  
  $300 k g / c m^{2}$
- 4
  
  $400 k g / c m^{2}$

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