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The triangles are similar. what is the value of x? show your work.

Helll ! 1,400 tons of wheat of two different varieties was delivered to the silo. when processing one variety, there was 2% of waste and 3% during the processing of the second variety of wheat. after the processing, the amount of remaining wheat was 1,364 tons. how many tons of each variety of wheat was delivered to the silo?

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?