Let us assume the number of cupcakes sold by Jose = x Then The number of cupcakes sold by Janet = 3x Total number of cupcakes sold by Janet and Jose = 28 Then x + 3x = 28 4x = 28 x = 28/4 = 7 So The number of cupcakes sold by Jose = 7 Then The number of cupcakes sold by Janet = 3x = 3 * 7 = 21 So the number of cupcakes sold by Janet is 21 and the number of cupcakes sold by Jose is 7.