5.5 x 10 ^-3 I need help on this question pls.

Pls! does anybody know a shortcut for answering these types of questions in the future?

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders

Finding tbe values of the variables in each kite