Question

Rico and his friend eat some lasagna. Rico eats 1/9 of lasagna, and his friend eats 1/18 of the lasagna. How much of the lasagna is left?

Answer 1

`(5)/(6)` of the lasagna is left

Explanation:

Given:

Amount of lasagna Rico eats = 1/9

Amount of lasagna His friend eats = 1/18

To Find:

The amount lasagna is left =?

Solution:

Total lasagna ate by both Rico and his friend = Amount of lasagna Rico eats + Amount of lasagna His friend eats

Total lasagna ate by both Rico and his friend =
`(1)/(9) + (1)/(18)`

Total lasagna ate by both Rico and his friend =
`(2)/(19) + (1)/(18)`

Total lasagna ate by both Rico and his friend =
`(3)/(18)`

Total lasagna ate by both Rico and his friend =
`(1)/(6)`

The amount lasagna is left = 1 - Total lasagna ate by both Rico and his friend.

The amount lasagna is left =
`1 - (1)/(6)`

The amount lasagna is left =
`(6-1)/(6)`

The amount lasagna is left =
`(5)/(6)`