Proportional relationship

Question

the manufacture of an oven states that the temperatures displayed while cooking are within a 5% error. Rachel is using the cook a chocolate cake that must be cooked at a temperature below 325 degrees Celsius. The oven display shows a temperature is suitable for cooking her cake? Explain your answer.

Answer 1

The answer is NO, for two reasons.

 

1. A range of ±5% will mean temperatures from 308.75^o to 341.25^o. So, the upper range will be too hot.

 

2. Second, "325 degrees Celsius" will translate into 617^oF, which is very hot, indeed.