a lady had 3 eggs she sold the first 20 for 15 cents each the next for 10 cents each, she got a total 700 cents for all. How many eggs did she have in all?

Question

anonymous · Answer

@hartnn  can you help

hartnn · Answer

let she have x eggs

20 for 15 cents each ----> 20*15 

remaining (x-20)

hartnn · Answer

those remaining for 10 cents each 
$\to (x-20)\times 10 $

hartnn · Answer

total = 700

so 
$\Large 20\times 15 + 10\times (x-20) = 700$

try to find x from here

hartnn · Answer

i ignored this : "a lady had 3 eggs"

anonymous · Answer

igot 22.967 hbu?

hartnn · Answer

how ? i am getting an integer number!

hartnn · Answer

ofcourse, "number of eggs" should be an integer.

hartnn · Answer

20*15 = 300

700-300 =400

400/10 = 40

anonymous · Answer

i got 40 at first but my uncle said it was wrong

anonymous · Answer

and this is how i did it i did 
20*15 = 300
700 - 300 = 400
400/10 = 40

hartnn · Answer

your uncle is correct

hartnn · Answer

haha! thats x-20 :P

x-20 = 40

add 20 on both sides

anonymous · Answer

60?

anonymous · Answer

well x = 60

hartnn · Answer

$\huge \color{red}{\checkmark \quad \ddot \smile}$

anonymous · Answer

can you show it again lol i got confused

anonymous · Answer

ooooohhh nvm nvm i get it cause they sold 40 for 10 cents and 40 plus the 20 she sold before = 60 eggs right?

hartnn · Answer

$\Large 20\times 15 + 10\times (x-20) = 700 \\Large 300 + 10\times (x-20) = 700 \ 10\times (x-20) = 700-300 $
....
okk....yes correct :)

anonymous · Answer

thank you so very much you are the best!

hartnn · Answer

welcome ^_^
you too are awesome ;)