Question

What do you add to 5 4/7 to make 7?

Answer 1

`1 3/7`

Explanation:

Converting both `5 4/7` and `7` to improper fractions with a denominator of `7`
`color(white)("XXX")5 4/7 rarr 39/7`
`color(white)("XXX")7 rarr 49/7`

We are being asked for the value of `x` such that
`color(white)("XXX")39/7+x=49/7`

subtracting `39/7` from both sides
`color(white)("XXX")x=10/7`

or as a mixed fraction `x= 1 3/7`