book Maths Puzzle Numerical Ability

(10a^2bc^4)^-2/(5^-1a^-1b^-5)^2

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book Other Question

the line 2x + 3y=1 intersects the curve x(x+y)=10 at a and b. calculate the coordinates of a and b. How many liters (L) of a 10% silver iodide solution must be mixed with 7 L of a 4% silver iodide solution to get a 6% solution?