500 = 200 + 20h is our equation. Subtract 200 from both sides 300 = 20h Divide by 20 300/20 = 15. It will take 15 hours to get 500 points. Hope this helps!
Number of pages that the chapter has = 8 Number of pages of the chapter that Kosta read = (1/4) * 8 = 1 * 2 = 2 The number of pages of the chapter read by Christina = 3 Then The total number of pages of the chapter read by both of them = 2 + 3 = 5 So the total number of pages of the chapter that has been read by Kosta and Christina is 5. I hope the procedure is clear enough for you to understand.