exam Maths Puzzle Numerical Ability

If I know that a + b + c = 100 and I also know that .5a + 3b + 10c = 100 how do I find the values of a, b and c?
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exam Other Question

How many of the following sets of numbers apply to 17.2353617� is a/an ____________________ number
____Natural number
____Whole number
____Integer
____Rational number
_��___Irrational number
_��___Real number Please help with the following problem:

Solve the system by addition method:

Eq 1 states 3x + 3y = 33
Eq 2 states 5x - 2y = 27

Please show work.

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