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stepan [7]
3 years ago
8

4. In one semester, Doug and Laura spent a combined 230 hours in the tutoring lab. If Doug

Mathematics
2 answers:
ANEK [815]3 years ago
7 0
The correct Answer is 80 hours
IRISSAK [1]3 years ago
6 0

Answer:

80 hours

Step-by-step explanation:

let d represent doug, let l represent laura

first, set up a system of equations representing the problem:

since doug spent 10 less than twice the hours laura did, and we know that the total amount of hours they spent together is 230:

l=2d+10

d+l=230

then solve:

*first i rearranged the equations so i can solve this system of equations using elimination method*

l-2d=10

l+d=230

*subtract*

3d=240

d=80

so, doug spent 80 hours in the lab

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