exam Maths Puzzle Numerical Ability

what is f(2a)=3x+5

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exam Other Question

Solve by method of choice
2x + 4y=8
x - y + 2=0
3x + 2y=7
I need help with this problem.
A drug manufacturing company wants to manufacture a capsule that contains a spherical pill inside. The diameter of the pill is 4mm and the capsule i