If a triangle jkl is classified as isosceles, which statement is true?

Geometry ? i don't know how to do any of these.

In a school 2/3 of the students study a language of those who study a language 2/5 study french

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?