(75,2)(50,3)(30,5)(25,6)(15,10)
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.80x=150 divide both sides by .80 x=150/.80=187.5
150
To find the number that, when multiplied by 5, equals 150, you would need to divide 150 by 5. This calculation gives you 30, meaning 30 times 5 equals 150. In mathematical terms, this can be written as x * 5 = 150, where x = 30.
If 23 % of X is 150, (0.23*X = 150) then it is obvious that X = 150/0.23 = 652,1739130434783... Because you can always divide both sides with the factor 0.23.
x-y = 120 x+y = 150 add equations: 2x = 270 x = 135 y = 15