Just solve until the answers are the same
25 times x plus 30 for John
15 times x plus 50 for Mary
A significant outcome is a meaningful result of an experiment as determined by statistical analysis. <span>Statistically significant results are those that are interpreted not likely to have occurred purely by chance and thereby have other underlying causes for their occurrence.</span>
7.8 should be it, i am so sorry if its wrong hope it helps if its correct!