Answer :
[tex]2x-number\ of\ Ms.\ Johnson\ report\\3x-number\ of\ Ms.\ Siple\ report\\\\2x+3x=300\\\\5x=300\\\\x=60\\\\2x=2\cdot60=120\\\\3x=3\cdot60=180\\\\Ms.\ Johnson\ reported\ 120\ cards,\ Ms.\ Siple\ reported\ 180\ cards.[/tex]