Question

If the denominator of 5/7 is increased by a number and the numerator is doubled, the result is 1. Find the number.

Answer 1

Answer:

3

Step-by-step explanation:

let n be the number, then

$\frac{10}{7+n}$ = 1 ← multiply both sides by 7 + n

10 = 7 + n ( subtract 7 from both sides )

3 = n