If the scale factor is increased in 2.5, the increased width will be:
Remember that an oblong is longer than it is wide, by this reason, the ratio of 4:3 could mean, if we give a number, by each 4 cm in the length, there is 3 cm in the width, in this form, if the oblong has a length of 12 cm, the width is:
4 cm ⇒ 3 cm
12 cm ⇒ x
Then, the original width is 9 cm, as the scale factor must be increased 2.5, we can multiply the found width to obtain the increased width:
Increased width = 9 cm * 2.5
<u>Increased width = 22.5 cm</u>
As you can see, <u><em>the increased widt will be 22.5 cm</em></u>.