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

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

The value of $${1.6×1.6×1.6−1.6×1.6×1.6}\over 1.6×1.6+1.6×1.6+1.6×1.6 $$ is

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)

? × 350.01 ÷ 3.992² = 983 ÷ 14.001

After interchanging the given two signs, what will be the value of the following expression?

× And ÷

20 + 5 ÷ 6 × 2 – 5

$$\left(4{2\over3} + {5{1\over 6}}\right)× {45 \%} \ of \ 240=?$$

If p – 2q = 4, then the value of p³ – 8q³ – 24pq – 64 is :

$$ if \ {1\over x}+x=4,$$ then find $${1\over x^2}+x^2$$