Mr peter just purchased a total of eight shrubs and trees for his yard. the total bill was $260. the shrubs cost $25 each and the trees cost cost $110 in total. write an equation to determine the number of shrubs purchased? variable? and equation?

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

Kelli swam upstream for some distance in a hour.she then swam downstream the same river for the same distance in only 6 minutes.if the river flows at 5km/hr, how fast can kelli swim in still water?

Whats is the value of the variables ?