Find the Value of ? 5.112.2+5.553.3+6.31.4+7.22.001 = ? x 3.34

This can be done in a method called Approximation.

Now, 

$52 + 63 + 6 + 72 = ? x 3.3425 + 216 + 6 + 49 = ? x 3.34296 = ? x 3.34? = \frac{296}{3.34} = 88.622 \cong 89$