The average number of questions Cody and Erika solved was 202. The average number of questions Erika and Tiffany solved was 197. The average number of questions Tiffany and Cody solved was 179. How many questions did each of them solve?
- Erika
- Cody
- Tiffany
(a)
Number of questions that Cody and Erika solved
= 202 x 2
= 404
Number of questions that Erika and Tiffany solved
= 197 x 2
= 394
Number of questions that Tiffany and Cody solved
= 179 x 2
= 358
Number of questions that Erika solved
= (404 + 394 - 358) ÷ 2
= 440 ÷ 2
= 220
(b)
Number of questions that Cody solved
= 404 - 220
= 184
(c)
Number of questions that Tiffany solved
= 394 - 220
= 174
Answer(s): (a) 220; (b) 184; (c) 174
