Has 44 coins; quarters and nickels. the combined value of the coins is $7. how many quarters and nickels does he have?

The number of nickel's coin is 20 and the number of quarter's coin is 24

Step-by-step explanation:

Let

x ----> the number of nickel's coin

y ----> the number of quarter's coin

Remember that

so

we have

----> equation A

----> equation B

Solve the system by substitution

substitute equation A in equation B

solve for y

Find the value of x

therefore

The number of nickel's coin is 20 and the number of quarter's coin is 24

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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step-by-step explanation: