exam Maths Puzzle Numerical Ability

y is less than or equal to 1/4x-1

please explain and show how i can solve this problem.
thanks!

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exam Other Question

log(x) + log(2x) = 10

Im really confused on this question. Ive been trying this:

log(x(2x))=10
log(2x-x^2)=10

but after that im not sure what to do next. Any help would be great. Thank you!!
how would i solve this problem?..... cadir is basting a roast turkey with a meat baster that creats a pressure of 9.980 x 10000 Pa when the plastic bulb is squeezed and released. i