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Hello!
total = 4 + 5 = 9
ratio 4 : 5
4/9 and 5/9
5/9 => 5 tons
4/9 => ??
?? = 4/9 x 5 ÷ 5/9 = 4 tons
dump truck1 = 5 tons
dump truck2 = 4 tons