If x = 222, y = 223 and z = 224, then find the value of x³+y³+z³-3xyz

Direction: What approximate value will come in place of the question mark (?) in the following question? (You are not expected to calculate the exact value)

(1110.02 + 89.81) ÷ ? – $${\sqrt{15}}$$= 15.98

What is the value of y in the following equation?
(1÷23) of [2{3 + 4(35 + 7)}] = y

Simplify the following expression.
12 + 2.5 + (1.5 of 4) - 2.6

 If $${1\over 4.263}=0.2346$$, find the value of $${1\over0.0004263}.$$

$$ 11^{2}-4096^{1\over 4}+100^{1\over2}=?$$

The value of x for which the expressions 7x + 13 and 13x - 7 become equal is _____ .

The value of $$5-{8+2\sqrt{15} \over4}-{{1}\over8+2\sqrt{15}}$$ is equal to: