The math class has a set of 40 calculators, and 85% of the calculators have working batteries. how many calculators need new batteries

6

Step-by-step explanation:

you will multiply 40 times .85 since the percent you move the period two times to the left you will get an answer of 34.

you will then subtract 34 out of the 40 and you will get the answer 6.

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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