math

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find each missing number.

1.)19/n = 0.76
2.)n:20 = 0.55
3.)n = 1:10 (n is a decimal)
4.) n% = 1:100
5.) n% = 33:100
6.) 99% (n is a decimal)
7.) n/25 = 17:25
8.) 41:n = 0.82
9.) n/25 = 0.08
10.) 21:n = 0.21

  • math -

    1.)

    19 / n = 0.76 Multiply both sides by n

    19 = n * 0.76 Divide both sides by 0.76

    19 / 0.76 = n

    25 = n

    n = 25


    2.)

    n : 20 = 0.55 Multiply both sides by 20

    n = 0.55 * 20

    n = 11


    3.)

    n = 1 : 10

    n = 0.1


    4.)

    n % = 1 : 100

    1 % = 1 : 100


    5.)

    n % = 33 : 100

    33 % = 33 : 100


    6.)

    99 % = 99 : 100 = 0.99


    7. )

    n / 25 = 17 : 25

    Obviously n = 17


    8. )

    41 : n = 0.82 Multiply both sides by n

    41 = n * 0.82 Divide both sides by 0.82

    41 / 0.82 = n

    50 = n

    n = 50


    9. )

    n / 25 = 0.08 Multiply both sides by 25

    n = 25 * 0.08

    n = 2


    10. )

    21 : n = 0.21

    Obviously n = 100 becouse

    21 : 100 = 0.21

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