book Maths Puzzle Numerical Ability

solve for x: sqaure root(3x+10) minus square root(x+3)=-1

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book Other Question

please can you answer ..... 3M x 4N

thanks Two vats contains cream, one sample tested 8% butterfat and the other tested 16% butterfat. How much cream should be taken from each to produce a 5 liters mixture w/c will test 12%