book Maths Puzzle Numerical Ability

I need to know how to solve inequalities of fractions for example 15 over 8 is less than or equal to 5 over 2 s

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Hi,

I am wondering if there's a way to express the proportion of THREE quantities as a decimal, or if there is a formula to express the proportion of each of the quantities othe find the variables
3x+4y-3c=5
x+6y+2c=3
6x+2y+3c=4
Please help me out this with step by step solution
thanks