Question

sophia has a total of 32 pictures. she has 17 pictures that are 5 millimeters wide. the rest of her pictures are 6 millimeters wide. what is the value of w, the total width of all of sophia's pictures?

Answer 1

w = (5a)+(6b)

w = width
a = # of 5mm pictures
b = # of 6mm pictures

From this we can see what is a and b:
32 - 17 = 15

a = 15
b =15

The 5mm wide pictures:
5 × 17 = 85

The 6mm wide pictures:
6 × 15 = 90

Now we add 'em up:
90 + 85 = 175mm

175mm
17.5cm