Question

tell me answer of 4th question

Answer 1

Ratio:

$\frac{4.98 \times {10}^{21} }{ {10}^{19} } = > \frac{498 \times {10}^{19} }{ {10}^{19} } \\ \\ = > \frac{498}{1} \\ \\ = > 498 : 1$