exam Maths Puzzle Numerical Ability

2x+4y=9
4x+5y=?
what is answer for 4x+5y=?
and x and y answers

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exam Other Question

Could someone please help me with this problem?
I need to solve the inequality and state the solution set:
x/x-3<=-8/x-6 (sign is less than or equal to) Thank you in advance!
Question 4

National Bi polar products (NBP) ltd manufactures and also sells two products. The demand function of each of the two products depend on the price of the two products