If a machine that prints designs on T-shirts prints 500 shirts in 3 hours, how many hours will it take to print designs on 1300 shirts?

It will take 7.8 hours to print designs on 1300 shirts

Step-by-step explanation:

We will use the ratio method to solve this question

∵ A machine prints designs on T-shirts

∵ It prints 500 shirts in 3 hours

∵ x is the number of hours to print 1300 shirts

→ By using the ratio method

→  shirts  :  hours

→   500   :  3

→  1300   :  x

→ By using cross multiplication

∵ 500 × x = 1300 × 3

∴ 500x = 3900

→ Divide both sides by 500

∴ x = 7.8

∴ It will take 7.8 hours to print designs on 1300 shirts

the thermometer is precise but not accurate

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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