Show 231 using the same number of tens and ones

10n + 1n = 11n = 231, and n = 21

Step-by-step explanation:

Let that "same number" be n.  Then 10n + 1n = 11n = 231, and n = 21.

Check:  Do 21 tens and 21 ones add up to 231?

                      210 + 21 = 231 ?  YES

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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