exam Maths Puzzle Numerical Ability

I HAVE $1.00 IN MY POCKET IT IS ALL IN COINS.
TOTAL COINS IS 50.
I HAVE 50 COINS IN MY POCKET WHICH IS EQUAL TO $1.00. WHAT IS THE BREAK DOWN OF COINS THAT I HAVE? HOW MANY OF EACH ?

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exam Other Question
these are suppose to be fractions but i did not know how to put them in.
1/3x + 3/4x = 13 the one third and the three fourths are fractions. thanks for the help. Find f(-3) if f(x) = -2x^3-8x^2+2x-1