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Tomtit [17]
2 years ago
7

A housepainter buys 40 gallon-size cans of paint for $920. Some of these are blue paint that cost $30 per gallon and the rest ar

e white paint that cost $20 per gallon. How many gallons of white paint does the painter buy?
Mathematics
1 answer:
zloy xaker [14]2 years ago
3 0

Answer:

28

Step-by-step explanation:

x=blue

y=white

x+y=40

30x+20y=920

30(x+y=40) ; 30x+30y=1200___[1]

30x+20y=920 ; 30x+20y=920___[2]

[1]-[2] : 30x+30y-30x-20y=1200-920

       10y=280

       y=28

painter buys 28 white gallons

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Given m||n, find the value of x.<br> (9x-5)(6x+20)
xxTIMURxx [149]

Answer:

5/9 & -10/3

Step-by-step explanation:

Set each to 0 and solve:

9x-5 = 0

9x=5

x=5/9

6x+20=0

6x=-20

x=-20/6

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7 0
3 years ago
*PLEASE HELP ASAP!!!! PLEASE SHOW YOUR WORK! THANKS!*
den301095 [7]
1 .Fridays and Saturdays, she works 16 hours

16 x $9.70  = $155.20
answer: her gross pay in a week: $155.20

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answer: his hourly rate was $8.95

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answer: percent of the meal cost was the tip was 12.5%

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5 0
3 years ago
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6 0
3 years ago
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8 0
3 years ago
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8 0
3 years ago
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