2 Dylan is part of a volunteer crew constructing houses for low-income families. Dylan is experienced at installing tile floors. He is training a new volunteer, George, to complete tiling projects. A new job involves placing 100 tiles. Dylan knows from experience that it would take him 2 hours to complete the job if he were working alone. Dylan estimates that it would take George 4 hours to complete the job if George were working alone. If Dylan and George work together, how long will it take to complete the job?

For the tiling Job; it takes the following for installing 100 tiles:

Dylan =2 hours

George = 4 hours

if they work together for the job, for 1 hour,

it would be the following no of tiles to be fixed:

Dylan + George =  total tiles

100/2  +  100/4  = 50 + 25 =  75 tiles

If it takes George 1hr to fix 50 tiles,

For 30 minutes, Dylan will fix 25 tiles

Therefore Total tiles fixed = Dylan(1hr work) + George(1hr work) + Dylan (30mins work)

= 50 tiles + 25 tiles + 25 tiles = 100 tiles

Therefore, it will take approximately 1 hour for them to install 75 tiles in the low-income house for the families or

1.30 hours (1 hr, 30 minutes) to fix 100 tiles for the same low income families.

Step-by-step explanation:

bn,mn,n.vn.

step-by-step explanation:

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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