Abox is filled with 13 yellow cards, 5 red cards, and 2 green cards. a card is chosen at random from the box. what is the probability that it is a yellow or a green card? write your answer as a fraction in simplest form.

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?