Answer: I think it is the second one
Step-by-step explanation:
Answer:
a. 3/5
b. 6 hours
c. 9 hours
Step-by-step explanation:
Given: Dave can clean pools at a constant rate of 3/5 pools/hour.
this means he cleans 3 pools in 5 hours
a.the ratio of number of pools to the number of hours= 3/5
b. since, we can clean 3 pools in 5 hours
this means he can clean 1 pool in 3/5 hours
so, he can clean 10 pools in 10×3/5 hours = 2 hours.
c. so, for 15 pools it will take 15×3/5 = 9 hours
I believe the answer is -2, 7
It is easy to multiply numbers by 10: you simply have to add an extra zero at the end.
This means that, using associative property, we know that
87 x 5 x 2=(87 x 5) x 2=87 x (5 x 2)
The last expression is the easiest to compute, because we have
87 x (5 x 2) = 87 x 10 = 870
Hope I helped.