text: how do you do this please i need help? 1.find 2 numbers ratio is 4:7 and whose difference is 39.   2.simplify these ratios.    a. 4m : 30cm   b. 2km :450m   c.400g:3kg   d. 420mm:30cm:0.7m                                            thankyou! try to understand the logic. let the two numbers be x and y. x/ y = 4/7 => 7x = 4y from this y is bigger than x.  y-x = 39 (difference is 39) 7y-7x = 7*39 7y - 4y = 7*39 y = 7*39/3 = 91 and x = 91 - 39 = 52  hope you got this.  for the second part,  use these 1 m = 100 cm = 1000 mm 1 kg = 1000 g 1 cm = 10 mm 1 km = 1000 m  these are not difficult, but i suggest you try yourselves instead of putting all homework questions on these. you can contact me on im/mail for further help.