In a school bus, there are 54 students, the ratio of boys to girls is 5:4. If 3 boys leave the bus at their stop, the ratio of boys to girls would be ?

The total number of students is 54, with an initial ratio of boys to girls of 5:4.

The ratio 5:4 means there are 5 parts boys and 4 parts girls.

Total parts $= 5 + 4 = 9$

Number of boys initially:

$\text{Boys} = \frac{5}{9} \times 54$

$\text{Boys} = 5 \times 6$

$\text{Boys} = 30$

Number of girls initially:

$\text{Girls} = \frac{4}{9} \times 54$

$\text{Girls} = 4 \times 6$

$\text{Girls} = 24$

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After 3 boys leave the bus:

Boys remaining $= 30 - 3 = 27$

Girls remaining $= 24$

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The new ratio of boys to girls:

$\text{Ratio} = 27 : 24$

To simplify, divide both by their common factor 3:

$27 \div 3 = 9$

$24 \div 3 = 8$

Therefore, the new ratio of boys to girls is $9:8$.