Find the measure of x.(please help)

If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?