exam Maths Puzzle Numerical Ability

squareroot of 72x^2y^3

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exam Other Question

please explain

you have x number of frogs, 5 of them die, you find 7 more frog each for 3 days, you have 45 frogs. how many did you start out with? How do I solve:

1) 1/3f = 4 - 2/3f
2) 3q - 5/8 = 0

Thank you
Maria