John is saving ⅔ of his allowance each week for a wireless headphones that he wants to buy. After 6 weeks he has$87 saved for the headset what is John's weekly allowance?

How much each week does John saves for the headset he wants to buy?

21.75

Step-by-step explanation:

if you take 87 divided by 2/3, you get 130.5, which is the total amount of money he makes in 6 weeks. but if you take 130.5 divided by 6, you get 21.75 which is how much he makes weekly.

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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