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Sagot :
[tex]8x+5x=390\\
13x=390\\
x=30\\\\
5x=5\cdot30=\boxed{150}[/tex]
the fastest method would be to add 8+5 and then divide 390 by it. And then that would be your base unit which you multiply to 8 and 5 to get your answers
8+5=13
390/13
30
30x8=240 adults
30x5=150 children
8+5=13
390/13
30
30x8=240 adults
30x5=150 children
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