math-nli: Output if sentence 2 Entails statement 1 or Contradicts statement 1 - 
sentence 1: A construction company bought 5.91 tons of gravel and 8.11 tons of sand . 
sentence 2:  The construction company bought 16.02 tons of material.
<equate> (5.91 + 8.11, 16.02)
A construction company bought 5.91 tons of gravel and 8.11 tons of sand . 
 The construction company bought 16.02 tons of material.