exam Maths Puzzle Numerical Ability

A machine can fill 3864 cartons of milk in 0.4 hour. How many cartons of milk can it fill per hour?

I came up this 7728. Can you tell me if this is correct?

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exam Other Question

can u assist me to solved the folowing problems.
1. tell weather or not (2,3) is a solution of the systm: 2x-3yis greater 0 and x+y is lesser than 4

2. tell whether or not Which of the following is the equation in slope-intercept form of the line that passes through (0, 2) and has a slope of -3.