**Ai Tong School organized a 2-day camp. On the first day, the number of boys was 600 more than the girls. On the second day, the number of boys decreased by 10% but the number of girls increased by 10%. If there were 2540 children on the second day, how many children were there on the first day?**

**Solution**

2nd Day

Boys --> 0.9 unit + 540

Girls --> 1.1 unit

Total --> 2540

0.9 unit + 540 + 1.1 unit --> 2540

2 units + 540 --> 2540

2 units --> 2540 - 540 = 2000

1 unit --> 2000 divided by 2 = 1000

1st Day

2 units + 600

(2 x 1000) + 600

= 2000 + 600

= 2600

**Answer: 2600 children**

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