Answers by visitors named: Jignesh Patel

Let price of book = x money arnold had after buying the book = 120-x money lucy had after buying the book = 36-x Money lucy has compared to arnold: 36-x = 1/5(120-x) 36-x = (120-x)/5 multiply both side by 5 5(36-x) = 120-x 180-5x = 120-x add 5x to both sides 180 = 120 + 4x 180 -120 = 4x 4x = 60 Therefore x = $15. So the price of the book is 15. Now you can test this value Money lucy had after buying the book = 36-15 = 21 Money Arnold had after buying the book = 120-15 = 105 And 21 is exactly one-fifth of 105 which is the money arnold had

Thanks so much !!!

Idk why but shouldn't it just be: 20 * 9.8 = 196 N? I think the length here is irrelavent

Numbers that are multiples of 5 from [5,25] are 5, 10, 15, 20, 25 Probability that a number is a multiple of 5: 5/20 =1/4 Numbers that are multiples of 2 from [5,25] are 6,8,10,12,14,16,18,20,22,24 Probability that a number is a multiple of 2: 10/20 = 1/2