Answer:
We should use C. 1.25
Step-by-step explanation:
We know that the children's book dimensions are 20 cm x 24 cm
We need to find a scale factor (which is a number) that will turn the dimensions 20 cm x 24 cm ⇒ 25 cm x 30 cm
We can write :
(20 cm) . a = 25 cm
Where ''a'' is the scale factor.
Solving for a :
\((20cm).a=25cm\\a=\frac{25cm}{20cm}=1.25 \\a=1.25\)
This result is reasonable because the scale factor won't have units
A scale factor of 1.25 turns 20 cm ⇒ 25 cm
We can use the another dimension to verify :
(24 cm) . a = 30 cm
(24 cm) . (1.25) = 30 cm
30 cm = 30 cm
The scale factor is option C. 1.25
