To simplify the expression \( 4q \times 5q^{67} \), follow these steps:
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Multiply the coefficients: \[ 4 \times 5 = 20 \]
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Combine the variables: Using the property of exponents \( q^1 \times q^{67} = q^{1 + 67} = q^{68} \).
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Combine the results: \[ 4q \times 5q^{67} = 20q^{68} \]
The simplified expression is: \[ \boxed{20q^{68}} \]