What exactly am I supposed to do here?

Astudent simplified a rational expression as shown.

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?

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.