De los 684 lanzamientos que realizó Alberto, falló 513. ¿Qué porcentaje de lanzamientos fallidos tiene Alberto? En una tienda deportiva hay balones blancos (40%) y balones multicolores (60%). Si hay 600 balones blancos, ¿cuántos hay en total?

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

In the picture below, line pq is parallel to line rs, and the lines are cut by a transversal, line tu. the transversal is not perpendicular to the parallel lines. note: figure is not drawn to scale. which of the following are congruent angles?

6. sarah saved $12.75 every week for a number of weeks, w. she received an additional $25 during the last week in which she saved money. write and solve an equation to find the number of weeks, w, for which sarah had saved money if she has $114.25 now.