Janes salary is 4 times Mary's salary. Together they earn 150 per week. Find the salary of both girls

Question

I don't understand

Answer 1

Let x be Mary's salary per week, so Jane's salary is 4x per week.

so x + 4x = 150

=> 5x = 150

=> x = 30

 

so Mary salary is 30, Jane salary is 120