How the air temperature changed: a) first increased by 25%, and then decreased
| August 29, 2021 | education
How the air temperature changed: a) first increased by 25%, and then decreased by 40%; b) first decreased by 60%, and then increased by 80%.
a) We take the initial temperature value equal to 100%.
Thus, after increasing by 25%, it was:
100% + 25% = 125% (of starting temperature).
After the new temperature decreased by 40%, it was:
125% * (100% – 40%) / 100% = 125% * 60% / 100% = 75%.
This means the temperature has dropped by:
100% – 75% = 25%.
Answer:
Decreased by 25%.
b) By analogy with the first task.
100% – 60% = 40%.
40% * (100% + 80%) / 100% = 40% * 180% / 100% = 72%.
100% – 72% = 28%.
Answer:
Decreased by 28%.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.
