Help! Please! This is math for 8th grade we just started to learn this but I’m not sure yet. Please someone help me!

Agrocery store has 12 lb of trail mix that is 10% banana chips. the store's manager would like to add banana chips to bring the new mix up to 25% banana chips. write and solve a system of equations to find out how many pounds of banana chips manager needs to add.

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

Solve with work adding cheese to a mcdonalds quarter pounder increases the fat content from 21g to 30g. what is the percent of change ?