MATH SOLVE

6 months ago

Q:
# How did the temperature change if: at first it decreased by 60% and then increased by 80%. PLEASE NEED HELP!

Accepted Solution

A:

The temperature decreased by 28%Step-by-step explanation:How did the temperature change if :At first it decreased by 60% Then increased by 80%Assume that the temperature before decreasing is 100%∵ The temperature before decreasing = 100%∵ It decreased by 60%→ Before decreasing : decreasing : after decreasing→ 100% : 60% : 100% - 60% = 40%∴ The temperature after decreasing = 40%Assume that the temperature after decreasing is 100%∵ The temperature after decreasing = 100%∵ It increased by 80%By using the ratio method→ After decreasing : increasing : after increasing→ 100% : 80% : 100% + 80% = 180%→ 40% : : x%By using cross multiplication∴ 100% × x% = 40% × 180%- Divide both sides by 100%∴ x% = [tex]\frac{(40)(180)}{100}[/tex]∴ x% = 72%∵ At first the temperature = 100%∵ At last the temperature = 72%∵ The first the temperature > the last the temperature∴ The decreasing in temperature = 100% - 72% = 28%The temperature decreased by 28%Learn more:You can learn more about ratio in brainly.com/question/2707032#LearnwithBrainly