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If you’ve already learnt Ratio, can consider presenting your answers using Ratio =)
You can view full video solution here – https://youtu.be/8Db_xy8RFD4
Let u = number of kids from 13-16 years old
1-6 years old [u][u][u][u][u][u] = 6u (1-6 yo twice as many of 7-12yo)
7-12years old [u][u][u] = 3u (7-12yo thrice as many of 13-16 yo)
13-16years old [u] = u
6u(3) + 3u(6) +u(12) = 1440
18u +18u+12u = 1440
48u = 1440 => u = 30
6u = 6x 30 = 180
Hence money collected from 1-6 years old category is 180x 3 = $540