Answer:
Pictures clicked by Drew =  27
Pictures clicked by Danielle  = 97
Step-by-step explanation:
The pictures captured by both of them = 124
Let us assume the pictures clicked by Drew = m
So, Pictures captured by Danielle  = 16 +  3( Pictures clicked by Drew)
                                                             =  16  + 3 m
Now, Total Pictures clicked by (Drew + Danielle) = m + (16 +3 m )
⇒ m + (16 +3 m )  =  124
or, 4 m = 124 - 16
⇒ 4 m = 108
or, m = 108/4 = 27, or m = 27
Hence, the pictures clicked by Drew = m = 27
and  the pictures clicked by Danielle = 16 + 4m = 16 + 81  = 97