Let n be the amount of time it takes for them to shampoo the carpet together. Then:
1/3+1/6=1/n
2n+n=6
3n=6
n=2 hours to shampoo the carpet together
☺☺☺☺
80
The question implies that you're counting by tens & the number comes after 70 and before 90. This is the only number that fits this description.
Answer:
Step-by-step explanation:
8 filters = $39.92
1 filter = 39.92 : 8 = $4.99
6 filters = 6 × 4.99 = $29.94
