Darren williams receives a monthly income of $600 from a pension and some from social security. his wife, laura, also receives a monthly income from social security, but only 70 percent of darren's amount. if their monthly income is $1,800 per month, how much is darren's monthly social security benefit?

  $705.88

Step-by-step explanation:

Let d represent Darren's monthly income from Social Security. Then 0.7d is the amount his wife receives. Their total monthly income is ...

  600 + d + 0.7d = 1800

  1.7d = 1200 . . . . . . . . . . . subtract 600, collect terms

  d = 1200/1.7 = 705.88

Darren's monthly Social Security benefit is $705.88.

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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