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since the cross multiples are equal, you find a product and use the inverse operation as you would in an equation Example 4 is to 36 as 3 is to X: 4/36 = 3/X --> 4*X = 3*36. Divide both sides by 4, to solve for X = 27. is over of = percent of 100 is/of=%/100 What is 10% of 40. is = x x/40 = 10/100 cross mulitply 40*10= 400/100=4 x=4
80/200 x/100 % 8000%/200 x x 40% 40%
12 x 5 = 60 That's because 12 x 100 = 600 12/2 = 6
x=-9 15 + x = 6x + 60 x = 6x + 45 -5x = 45 x = -9 15 + (-9) = (6 * (-9)) + 60 15 - 9 = -54 + 60 6 = 60 - 54 6 = 6 There is no answer because, 15+x=6x+60 -15 -15 x=6x+45 Which is imposible because "x" can't equal itself times six plus forty-five.