Chloe and denise bought a identical t-shirts from the same shop. chloe bought on monday when there was a 15% off the original price. denise bought on froday when there was 20% off the original price. chloe paid 35p more than denise. what was the original price?

Suppose there is a simple index of three stocks, stock abc, stock xyz, and stock qrs. stock abc opens on day 1 with 4000 shares at $3.15 per share. stock xyz opens on day 1 with 5000 shares at $4.30 per share. stock qrs opens on day 1 with 6000 shares at $4.60 per share. the price of stock abc on day 8 begins at $3.50. the price of stock xyz on day 8 begins at $3.90. stock qrs opens on day 8 with a price of $4.50 per share. assume that each stock has the same number of shares that it opened with on day 1. what is the rate of change of this simple index over 1 week?

How do you solve a question like this?

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.