[Question]198 passengers fit into 9 buses. How many passengers fit in 5 buses?
[Answer]198 passengers / 9 buses = 22 passengers fit in one bus. 22 passengers / bus * 5 buses = 110 passengers fit in 5 buses. The answer is 110.

[Question]Arthur has $200 in his wallet. He spends four-fifths of that. How much does he have left?
[Answer]Arthur spent 4 / 5 * $200 = $160. Thus he has $200 - $160 = $40 remaining. The answer is 40.

[Question]Tina is working on her homework when she realizes she's having a hard time typing out her answers on her laptop because a lot of the keys are sticky. She is trying to get her homework done before dinner, though, so she needs to decide if she has time to clean her keyboard first. Tina knows her assignment will only take 10 minutes to complete. Dinner will be ready at 5:30 p.m. Tina decides to time how long it takes to remove and clean one key and will then multiply that time by how many keys she needs to fix. She counts 15 keys that are sticky and times it to take 3 minutes to clean one. After Tina has cleaned one key, there are 14 left to clean. How many minutes total will it take for Tina to both clean the remaining keys and finish her assignment?
[Answer]Tina has already cleaned one key so she has 14 left which take 3 minutes each to clean, 14 x 3 = 42 minutes to clean all the keyboard keys. Her assignment will take 10 minutes to complete, so she needs 42 minutes + 10 minutes = 52 minutes total before dinner. The answer is 52.

[Question]Ryanne is 7 years older than Hezekiah. Together Ryanne's and Hezekiah's ages equal 15 years. How many years old is Hezekiah?
[Answer]
Let H = Hezekiah's age. Ryanne = H + 7. 2H + 7 = 15. 2H = 8. H = 4. Hezekiah is 4 years old. The answer is 4.