One number is 3 more than twice another number. if the sum of two number is 39, find the two numbers

(X+3)^2-x^2=39  x^2+6X+9-x^2=39 6x+9=39. 6x=30 x =5 x+3=8

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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