The number of pupils in Team A to the number of pupils in Team B is in the ratio of 7:6. If 45 pupils are transferred from Team A to Team B, the ratio will become 2:3. How many pupils are there altogether?
Solution
Note - "Before" is multiplied by 5, while "After" is multiplied by 13 so as to have an equal number of total units of 65 each. The total number of units for "Before" and "After" are the same because there was no increase or decrease in the total number of pupils before or after the transfer.
Team A had a decrease of
35 units – 26 units --> 45 (pupils)9 units --> 45
1 unit --> 45 divided by 9 = 5
Total number of pupils
Team A + Team B
26 units + 39 units --> 65 units
65 units --> 5 x 65 = 325
Answer: 325 pupils
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