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