By comparism using the given scale ratio, the weight of Ellie at birth is 7.7pounds.
What is Ratio?
Ratio simply compares values, it shows how much of one thing is related or compared to another thing.
Given the data in the question;
- Scale of Emma SEmma = 0.75pounds
- Scale of Emma SEllie = 0.9pounds
- Weight of Emma WEmma = 6.4pounds
- Weight of Ellie WEllie = X
To determine the weight of Ellie, we simply say;
0.75pounds : 0.9pounds = 6.4pounds : X
0.75pounds / 0.9pounds = 6.4pounds / X
Cross multiply
0.75pounds × X = 0.9pounds × 6.4pounds
0.75pounds × X = 5.76pounds²
X = 5.76pounds² / 0.75pounds
X = 7.68pounds
X = 7.7pounds
Therefore, by comparism using the given scale ratio, the weight of Ellie at birth is 7.7pounds.
Learn more about ratio here: https://brainly.com/question/13419413
