book Maths Puzzle Numerical Ability

(6a-5y)(7a+3y)

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book Other Question

Either perform the indicated operation or solve the equation, whichever is appropriate.


3/10 = 5/x
One salt solution is 15% salt and the other is 20% salt. How many cm^3 of each must be mixed in order to obtain 50 cm^3 of 16% salt solution?
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