1. Cost of 10 book is Rs 300. Find the cost of 20 book.
Solution:
Cost of `10` book=Rs `300`
Cost of `1` book = `(300)/(10)=30` Rs
`:.` Cost of `20` book = `30 xx 20=600` Rs
2. Cost of 20 cream is dollar 100. Find the cost of 5 cream.
Solution:
Cost of `20` cream=dollar `100`
Cost of `1` cream = `(100)/(20)=5` dollar
`:.` Cost of `5` cream = `5 xx 5=25` dollar
3. Cost of 10 book is Dollar 300. Find the cost of ? book in Dollar 600.
Solution:
In Dollar `300`, for `10` book
`:.` Cost of `1` book = `(300)/(10)=30` Dollar
Means in Dollar `30`, for `1` book
`:.` In Dollar `600`, for `(600)/(30)=20` book
This material is intended as a summary. Use your textbook for detail explanation.
Any bug, improvement, feedback then
