Solve this world problem. half of a number, plus a fifth of two less than the number ,is 4 less than the number .what is the number

Step-by-step explanation:

let x be the number

1/2x + 1/5(x - 2) = x - 4

1/2x + 1/5x - 2/5 = x - 4multiply by 10 to get rid of the fractions

5x + 2x - 4 = 10x - 40

7x - 4 = 10x - 40

-4 + 40 = 10x - 7x

36 = 3x

36/3 = x

12 = x <===

idk

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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