Last year at a certain high school, there were 124 boys on the honor roll and 125 girls on the honor roll. This year, the number
1 answer:
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Answer:
If and
, then
Step-by-step explanation:
This is a problem that utilizes both substitution and the order of operations.
Here we can use fact than we can multiply fraction by inverse of fraction instead of dividing it.
Inverse of 1/3 is 3/1
Lets multiply it
- its our result
Inverse of 1/3 is 3/1
Lets multiply it
Answer:
Speed of river's current = 5 mph
Step-by-step explanation:
Let 'd' be the distance covered
Let x be the speed of the rivers current
Speed upstream = 15-x
speed downstream = 15+x
Time = distance / speed
time upstream =
time downstream =
the ferry trip upstream takes twice as long as its return trip downstream
=
divide both sides by d
=
cross multiply
Add 2x on both sideds
subtract 15 from both sides and divide by 3
x=5
Speed of river's current = 5 mph