Factoring Example: find the GCF of 20,50,120 Just find the factors of each number The factors of 20 are 1,2,4,5,10,20 The factors of 50 are 1,2,5,10,25,50 The factors of 120 are 1,2,3,4,5,6,8,10,12,15,20,24,30,40,60,120 the common factors of 20,50,120 are 1,2,5,10 just the numbers common to all three. the greatest common factor of 20,50,120 is 10
(This is what I think) First, we minus 720 from her 1000. Now she has $280 left. 280 divided by 28 (the trainer cost) is 10. So, she can spend 10 hours with the personal trainer.