UN FUTBOLISTA HA METIDO LOS 2/5 DEL NUMERO DE GALONES MARCADOS POR SU EQUIPO Y OTRO LA CUARTA PARTE DEL RESTO. SI LOS EMAS JUGADORES HAN CONSEGUIDO 45 GOLES
CUANTOS GOLES METIÓ EL EQUIPO DE TODA LA TEMPORADA?

(a) calculate the molarity of a solution that contains 0.0345 mol nh4cl in 400 ml of solution. (b) how many moles of hno3 are present in 35.0 ml of a 2.20 m solution of nitric acid? (c) how many milliliters of 1.50 m koh solution are needed to supply 0.125 mil of koh ?

How do i do this activity, is appreciated

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.