Question

Find the cost of 30 note books at the rate of rs. 20 per dozen?

Answer 1

Answer:

Dozen means 12 books

so,

12books=20rs

30books=?

let the cost of 30 books be x

cross multiply

we get,

30*20=12*x

30*20/12=x

600/12=x

50=x

therefore the cost of 30 books is R.s 50

Answer 2

Answer:

1dozen means 12books =rs 20

then, 1book cost rs =20/12

then 30books =20/12*30=50

so 50,isthe cost of 30books

I hope this answer help you

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