Question

El 70 porciento de mi nota final es 4,2 cual sera la nota final

Answer 1

$nota \: final = x \\ \\ 70\%(x) = 4.2 \\ \frac{70}{100} \times x = \frac{42}{10} \\ \frac{7x}{10} = \frac{21}{5} \\ \frac{x}{10} = \frac{3}{5} \\ \frac{x}{2} = \frac{3}{1} \\ x = 2 \times 3 \\ x = 6$