The school band is scheduled to march in the annual parade, but the band’s starting point is changed the day before the parade. The band director calls three band members. Each band member calls three other band members. Then these band members each call three members. How many band members, including the band director, are notified of the new starting point?
You start out with 3 band members knowing, but to represent these 3 each telling 3 more, just multiply 3 x 3 = 9 girls told. Take your 9 girls and multiply them each by 3 too to get 27 girls told. Don't forget your original 3 and add those to your 27 to get 30.