Question

http://prntscr.com/1at9zq


explain this!!

Answer 1

any attempt ?

Answer 2

nope!

Answer 3

let size of large apple = x , of small apple = y

can you express sizes of small and large box using only x and y ?

Answer 4

large box= 10x+15y or 20x
small box=10x+5y

is this right?

Answer 5

thats right
note that 10x+15y = 20x
or 2x = 3y

so size of large box = 30y
size of small box = 20y
where I have represented both in terms of 1 variable

Answer 6

ok...

Answer 7

Now let p large and q small boxes are required for the final packing
total size required = 500x + 200y = 950y

let us fix number of small boxes = 0, because we need to minimize number of small boxes
1 small box's size = 20y
1 large box's size = 30y

easily we see 950y can not be formed by only large boxes because 950y is not divisible by 30y for some integer y

next attempt, number of small boxes =1
size of 1 small box = 20y
size remaining = 950y-20y = 930y

here, 930y is completely divisible by 30y which is the size of 1 large box

930y/30y = 31
hence 31 large and 1 small is the req ans

Answer 8

Forget about the p and q
:P

Answer 9

I just took them in case we needed them later, which eventually we didn't

Answer 10

wow that, was a great explanation! tmhay kaisay pata chala k humein issay is tarah solve karna chaiye ? because i was completely blank

Answer 11

zyada info given nahi thi ques me, jitna given tha, usi se eqns banane ka try kiya.. ho gaya eventually
soln type karte time mujhe nahi pata tha solve ho jayega, bas likhta gaya and aa gaya :|

Answer 12

wah! mujeh to bilkul samj nai araha tha k kya logic lagao :@

Answer 13

hmm, experience se striking power better ho jata hai :)
keep practicing

Answer 14

true!
thanks a ton :)

Answer 15

glad to help (Y)