Six youngsters, all exchange students from Guayaguil, Ecuador, watch as Mrs. Lucy Rushing, a data processing teacher, explains the complicated system to them. Standing, from left, the girls are: Manuela Pareja, Elizabeth Jimenez, Margarita Hinojosa, Pamela Chong-Qui, Mariana Arias and Patricia Macias.

Photo is dated 1970.

Photo measures 10 x 8.25 inches.