Two hours ago, a store owner started his day with some chikoos and oranges in the ratio of 5 : 2. There were 20 oranges. Some of the chikoos were bought by Elyse. As a result, the number of chikoos became
25 of the oranges.
- How many chikoos did the store owner have left?
- How many chikoos did the store owner have to buy in order to have an equal number of chikoos and oranges?
|
Chikoos |
Oranges |
Before |
5x5 = 25 u |
2x5 = 10 u |
Change |
- ? |
|
After |
2x2 = 4 u |
5x2 = 10 u |
(a)
The number of oranges remains unchanged. Make the number of oranges the same. LCM of 2 and 5 is 10.
10 u = 20
1 u = 20 ÷ 10 = 2
Number of chikoos that the store owner had left
= 4 u
= 4 x 2
= 8
(b)
Number of chikoos that the store owner had to buy to have an equal number of chikoos and oranges
= 10 u - 4 u
= 6 u
= 6 x 2
= 12
Answer(s): (a) 8; (b) 12