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Orange : Mango = 2u : 3u

After 21 mangos were removed and 21 oranges added, the number of mango became (3u – 21). Pls take note that the total number of fruits are the same at 5u.

Given 

( 3u – 21)/5u = 25% = 1/4                 Multiply both sides by 20u

4( 3u – 21) = 5u

12u – 84 = 54

7u = 84

u = 12

2u = 24

There were 24 oranges at first.

 

 

Check: 3u – 21 = 15

5u = 60

15/60 = 14 = 25%  Checked.

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