exam Maths Puzzle Numerical Ability

Find the value of x

log27 9=x

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exam Other Question

Solve using addition and multiplication principals.

5 + 4x < 21
The solution set is {x/x ??}

Solve the following system of equation

x + 4y = 2 (1)
x = 7 -4y (2)
What is the soltution of the system? (2,3);(-2,3);(-2,-3);(2,-3).If you join these points ,What will the shape be?My answer is square.