Answer:
Pritam gets $22.50
Explanation:
Ratios
Pritam =3
Sarah=6
Emily=4
The ratio between Sarah and Emily = 6:4
=3:2
 If Sarah gets $15 more than Emily
Then, 
Sarah gets $45 
Emily gets $30.
The ratio between Pritam and Sarah = 3:6
= 1:2 
Since Sarah gets $45, 
Pritam gets half as much= $45 / 2
=$22.50