How do you use cross products to solve s/11=30/110?

1 Answer
Apr 4, 2017

Cross multiply to get s=3

Explanation:

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We can use the cross multiplication formula.
Following the image's suggestions, we can plug in s for a, 11 for b, 30 for c, and 110 for d.

We'd multiply a and d, and b and c.

a*d=s*110 and b*c=11*30.

s*110=110s, and 11*30=330.

We'd then set the two values equal to each other: 110s=330. We'd want to get s to its simplest form, so divide both sides by 110.

(110s)/ 110=s, and 330/110=3, so s=3.