Jenson has 40% more pens than Tom. Perry has 80% the number of pens Jenson has.
- What is the ratio of the number of Tom's pens to the number of Perry's pens?
- If the total number of pens of Jenson's and Perry's is 380 more than Tom's, how many pens does Jenson have?
Jenson |
Tom |
Perry |
7x5 |
5x5 |
|
5x7 |
|
4x7 |
35 u |
25 u |
28 u |
100% + 40% = 140%
140% =
140100 =
75 Jenson's pens : Tom's pens = 35 : 25
80% =
80100 =
45 Perry's pens : Jenson's pens = 28 : 35
Tom's pens: Perry's pens = 25 : 28 (a)
Jenson's pens + Perry's pens = 35 u + 28 u = 63 u
Tom's pens = 25 u
63 u - 25 u = 380
38 u = 380
1 u = 380 ÷ 38 = 10
Number of Jenson's pens
= 35 u
= 35 x 10
= 350 (b)
Answers: (a) 25 : 28; (b) 350