exam Maths Puzzle Numerical Ability

I really dont get how to do this. Here it is- Jacob has $3.50 in nickels and dimes. He has twice as many dimes as nickels. How many nickels and how many dimes does he have?

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exam Other Question

if a block of land 598m^2 is valued @$39000 and a alternative block 980^2 at$64000. which block is rated value for money on a dollar for metre basis?

a patient to receive 420 mi write the slope intercept form for an equation of the line perpendicular to the graph of the given equation and passing through the given point?
5y=-x+1, (2,-5)