Carly and rob combined their dvd collections now they have 42 dvd all together carly had 4 more dvd then rob how many dvd did carly have. me

You first have to divide 42 by 2 and you get 21. Then subtract 21-4 and you get 17. Then add the other half which is the other 21 by 4 and you get 25. 17+25=42 Rob has 17 DVD and Carly has 25 DVD.

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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