Salil wants to put a picture in a frame. The picture is 
cm wide. To fit in the frame, the picture cannot be more than 
cm wide. How much should the picture be trimmed?
It is given in the question that,
Width of picture = 7
= 
cm
Also,
Required width = 7
= 
cm
Therefore,
The picture should be trimmed by = (
)
= (
– 
)
= 
= 
cm
15