Bob believes his test grade varies directly with the number of hours he spends studying and inversely with the number of hours he spe

Question

Bob believes his test grade varies directly with the number of hours he spends studying and inversely with the number of hours he spends playing baseball. On his first​ test, he spent 7 hours studying and 4 hours playing baseball and scored a 42. What score should he expect on his second test if he studies 5 hours and plays baseball for 3 ​hours?

in progress 0
Iris 2 weeks 2021-10-04T15:00:01+00:00 1 Answer 0 views 0

Answers ( )

    0
    2021-10-04T15:01:58+00:00

    Answer:

    40

    Step-by-step explanation:

    • Study- s=7 hrs,
    • Play- p=4 hrs
    • Score- 42

    Score varies directly with hours of study and inversely with hours of play so the score has a coefficient x as:

    • score=x*s/p

    Applied to first test we get:

    • 42=x*7/4 => x=42*4/7=24

    Now we got the coefficient of 24 which should be same for the second test

    If we apply same to second test, then:

    • Study- s=5 hrs,
    • Play- p=3 hrs
    • score= 24*5/3= 40

    So expected score is 40

Leave an answer

Browse
Browse

18:9+8+9*3-7:3-1*13 = ? ( )