The number of ducks swimming In a lake decreased by 1/4 between last year and this year. last year there were 60 ducks in the lake. What is the population this year? If you get stuck consider drawing a diagram.

Given: Population of ducks in lake, last year is 60.

Also, the population of ducks this year decreased by 1/4 th over the last year.

So, the population of ducks this year is = 60*(1-1/4)

                                                          = 60*(3/4)

                                                          = 45

Therefore, the population of ducks this year is 45 ducks.

expression #3 is not equivalent. the others are.

$450 i think. hope this ☺