exam Maths Puzzle Numerical Ability

Need help in solving this it is not a test but for our homework. Every way I have worked it I get a different answer. 0.4p+0.2=4.2p-7.8-0.6p

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exam Other Question
Several values of the two functions f and g are listed in the following tables
x 4 5 6 7
f(x) 7 6 5 4


x 4 5 6 7
g(x) 6 7 4 5

find (f*g) (6 A pharmacist needs 70 liters of a 50% alcohol solution. She has availible a 30 % solution and an 80% solution. How many liters of each solution should she mix to obtain 70 liters of a 50% alcohol solution ?


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