exam Maths Puzzle Numerical Ability

For x>0, what is 7x divided into 2 then divide by 1 divided into 4x

a. 3.5x
b. 14x
c. 28x
d. 14x^2
e. 28x ^2

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exam Other Question

Change 7/2 to a mixed or whole number.
ok would this be 3 1/2 or 3.5? Or neither?
Please help

x/3-1/4=3x-8/12

Thank you