exam Maths Puzzle Numerical Ability

A vending machine contains $22.15. The machine contains 195 coins, which consist of only nickels, dimes, and quarters. If the machine contains five times as many dimes as nickels, how many nickels does the machine contain?

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exam Other Question

Please help- I am so lost on this one!:
-2x+5x-9=3(x-4)-5
3x-9=3x+-12+-5
3x-9=3x+-17
+9 +9
3x=3x-8
3x/3=3x/3-8
x=x-8
+x+x
2x/2=-8/2 x=-4
so at what point am I going wrong? thanks! Find the perimeter of a rectangle. Write your
answer in radical form.

One side is sqrt 147 the other is sqrt 108