book Maths Puzzle Numerical Ability

x/4 + 3x/5 = 17

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book Other Question

a container contains 8 liters of a mixture of water and salt. the mixture is 70% salt. how much pure salt must be added to make it 80% salt? solve /x/= 7
^absolute value
and...
solve /x/= -9

and...
solve and graph /x+5/<= 2