This is what I did for number 1:
2.)The National History Museum has collected 125 dinosaurs. George has collected 3/5 of of this amount. How many dinosaurs has George collected?
This is what I did for number 2:
3.) Mr.Murrin is 160cm tall and his brother Tom is 7/8 as tall as him. How tall is Tom?
This is what I did for question 3: