A store has two brands is pencils on sale for the day. Brand a comes in packs of 4 and brand b comes in packs of 10. If an equal number of each brand sold what is the minimum number of each sold

Respuesta :

you need to find the lcm of 4 and 10 
4:10 8:20 12:30 16:40 20:50 
lcm/Answer is 20