Two–thirds of the children in the fourth–grade class are girls. If there are 18 girls, what is the total number of children in the class? children

ANSWER

My answer is in the photo above

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis:

it's undefined because anything multiplied by 0 is 0. that said, 7 days is 168 hours