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Bus carries 42C or 36A.

Either 6 sets of 7Children  or    6 sets of 6Adults

Now, 4 sets of 7Children is taken up (by 28 Children)

Left 2 sets of 6Adults (by 12 Adults). Remaining adults is 12-8 = 4 adults.

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Since we told the bus holds a maximum of 42 children OR 36 adults,let’s express adults in terms of Children
A/C = 36/42
A = 36/42 (C)

there 28 childrem is equivalent to 36/42(28) = 24 Adults.

equivalent passengers on the bus = 24 + 8 = 32 Adults.

Number of Adult that are able to board = 36 -32 = 4 Adults ###

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