50 POINTS! PLZ HELP NO ONE HELPED ME LAST TIME BUT I HOPE SOMEONE WILL THIS TIME! ALSO DON'T KNOW WHY I'M WRITING IN ALL CAPS

Step-by-step explanation:

Let x be the number of helium balloons they can buy

I hope this helps!

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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