book Maths Puzzle Numerical Ability

My wallet contains $3409.00 in ones, twenties, and fifties. Find the number of each kind of bill if there are 6 fewer ones than twenties and 24 more twenties than fifties.

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book Other Question
Write the first five terms of the follownig sequence.
a sub n = n + 1/ n with the condition: a sub n= a sub n-1 + 2, where a sub n= 1 can anyone tell me how to graph an equation, for example like
y = 2x + 2