Let x = 597 x 1022 + 73.5 x 1021. When x is expressed in standard form as 6.0435 x 10m. then the value of m is
22
23
24
21
The multiplication of the age of Rajeev, before 5 yr and after 9 yr, is 15. What is the present age of Rajeev ?
6yr
7yr
5yr
8yr