Respuesta :

we know that

10 pages -------> represent 50%

so

Multiply by 2 both sides

20 pages --------> 100%

therefore

the paper length is 20 pages

Apply proportion

Remember that the paper length represent the 100%

10/50=x/100

solve for x

x=10*100/50

x-20 pages

100/50

x-20 pages