The population of a city is 25,000. if the number of males is 240 more than the number of females, how many males and females are there in the city ?

M=f+240

m+f=25000, using m from above in this equation gives you:

f+240+f=25000  combine like terms on left side

2f+240=25000  subtract 240 from both sides

2f=24760  divide both sides by 2

f=12380, and since m=f+240

m=12620

So there are 12620 males and 12380 females in the city.