A parking machine contained $3.05 made up of dimes - вопрос №12305602305 от saskii 22.01.2020 04:31

Question

Математика: A parking machine contained $3.05 made up of dimes and quarters. there were 20 coins in all. how many dimes were there?

saskii · Answer

1 dime = $0.101 quarter = $0.25If we have x dimes, then we have (20-x) quarters.x*0.1 + (20-x)*0.25 = 3.050.1x + 5 - 0.25x = 3.050.25x - 0.1x = 5 - 3.050.15x = 1.95x = 1.95/0.15x = 13 - number of dimes...