Twice the square of a certain whole number addd to 3 times the number makes 90. find the number

Ineed with number 17 i don’t get it at alll

I'm confused on this could anyone me and show me what i need to do to solve it.

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?