exam Maths Puzzle Numerical Ability

What is four less than the product of 6 and a number is eight

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exam Other Question

Used by itself, the cold water faucet can fill a bathtub in 12 minutes. It takes 15 minutes for the hot water faucet to fill the bathtub. If both faucets are on, how long will it take to fill the bathtub?(round to the nearest .01 minute) Convert to a exponential equation.
In 4a=1.9
A) 1.9e=4a
B) e1.9=4a
C) ea=1.94
D) e4=1.9a