Which demographic challenge is europe currently experiencing? a. an aging and decreasing population b. a baby boomc. an unequal distribution between males and females d. a large group of teenagers moving through the school system(i chose a but i'm unsure)(i cant delete my last question, sorry)

The correct answer is - A. An aging and decreasing population.

Europe is a continent that has big troubles with the low birth rates in the past few decades. In almost all of the countries on the continent the birth rates are very low, not even enough for the population to stay at a same number, even though for such a thing, only an average of two children per women are needed. There's actually only two countries (three if we count Kosovo) in Europe that have birth rates high enough for the population to grow, Ireland and Albania.

The life expectancy is also relatively high in Europe, so the low birth rates, and high life expectancy are resulting in an aging population, which is slowly declining, but that decline is expected to increase significantly in the near future.

part a. there were 250 teenagers surveyed (100% of tenagers = 250)therefore 1 % = 250/100 = 2.5 76% = 1% x 76 = 2.5 x 76 = 190 teenagers of the 250 surveyed liked burgerspart b: jane surveyed 25% (which is equal to 50 teenagers, i.e. a quarter of the teenagers surveyed is 50) to get 100% we simply get 4 quarters, i.e. multiply 50 by 4 = 200 teenagers were surveyed by jane. part c: it is impossible to give an example where a percentage is greater than 100%, since, by definition , percentage means "per 100".