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% = $$\frac{(40)(180)}{100}$$∴ 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