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

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

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

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

158.25 x 4.6 + 21% of 847+?= 950.935045

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)

? ÷ 2.997 + 799.98 × 8.9 = 9199.978

Evaluate the following:
5 - [96 ÷ 4 of 3 - (16 - 55 ÷ 5)]