exam Maths Puzzle Numerical Ability

a - -10 < -5

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exam Other Question

Please HELP!! I cannot solve this can someone help me?

5
over
x+6
plus
2
over
x^2+7x+6
equals
3
over
x+1 i cant figure this one out
how many liters of water must be evaporated from 10L of 40% salt solution to produce a 50% solution

THANKs ALOT