42 x 30 = 1,260
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42 - 30% = 42 x (1 - (30/100)) = 42 x 0.7 = 29.4
The greatest common factor for 42 and 30 is 6.6 x 7 = 426 x 5 = 30
x=42
30 and 12 30 + 12= 42 30 x 12= 360
We will call the two numbers X and Y. 1) X + Y = 102 2) X - Y = 42 3) Rearrange the second equation ---> X = Y + 42 and plug into the first. 4) (Y + 42 ) + Y = 102 5) 2Y + 42 = 102 6) 2Y = 60 7) Y = 30 * 8) Plug into the second equation ---> X - 30 = 42 (so X = 42+ 30) 9) X = 72 * 10) 72 is the answer.