Justine answered 68 questions correctly on an 80 question test. What percent of the question did Justine answer correctly? To find the percent of questions that justine answered incorrectly, subtract your answer to a from 100%:100%

Justine got 85% of the questions correct.

Step-by-step explanation:

Divide 68 by 80 and get the answer 0.85.

x = 15

Step-by-step explanation:

Llamaremos x al número que buscamos, entonces:

la mitad de x es  x/2, la tercera parte es x/3, y el triple del número es 3*x

De acuerdo al problema :

(x/2 - x/3 ) + 85/2  = 3*x

Esta es una ecuación de primer grado pasamos a resolverla.

( 3*x  -  2*x ) /6   + 85/2  = 3*x

x/6 + 85/2 = 3*x

( x + 255)/6 = 3*x

x  +  255  = 18*x

17*x  = 255

x  = 255/17

x = 15