exam Maths Puzzle Numerical Ability

4x+24=3x+3y
x-3y=-24

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exam Other Question

Freeport Mc MoRan projects that in 2010 world grain supply will be 1.8 trillion metric tons and the
supply will be only 3/4 of world grain demand. What will world grain demand be in 2010? how would i simpligy this expression sqrt 16a^4x^2