Question

when ryan was born, he weighed 7 pounds. at 6 months, he weighed 11.2 pounds. amanda weighed 6 pounds when she was born, and 12.9 pounds at 6 months. which baby had a greater percent increase in weight? explain.

Explanation:

Step1: Calculate Ryan's percent increase

Percent increase formula: $\text{Percent Increase} = \frac{\text{New Value} - \text{Original Value}}{\text{Original Value}} \times 100\%$
Ryan's original weight: $7$ pounds, new weight: $11.2$ pounds
$\text{Increase for Ryan} = 11.2 - 7 = 4.2$
$\text{Percent Increase for Ryan} = \frac{4.2}{7} \times 100\% = 60\%$

Step2: Calculate Amanda's percent increase

Amanda's original weight: $6$ pounds, new weight: $12.9$ pounds
$\text{Increase for Amanda} = 12.9 - 6 = 6.9$
$\text{Percent Increase for Amanda} = \frac{6.9}{6} \times 100\% = 115\%$

Step3: Compare the two percent increases

$115\% > 60\%$, so Amanda had a greater percent increase.

Answer:

Amanda had a greater percent increase in weight. Ryan's percent increase was 60%, and Amanda's was 115%.