Math algebra

1) Charlie plans to sell twice as many magazine subscriptions as Patrick. If Charlie and Patrick need to sell at least 100 subscriptions in all, what inequality could be used to determine how many subscriptions, x, Charlie needs to sell?
I really don't understand this.

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  1. Just think of Patrick's subscriptions as the variable p. Charlie wants to sell twice as many as Patrick, so he's gonna sell 2p subscriptions.

    We know that they both need to sell at least (meaning greater than or equal to) 100 subscriptions, so...

    (Patrick) + (Charlie) ≥ 100
    p + 2p ≥ 100
    3p ≥ 100
    p ≥ 33.3333...

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