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7.) Plumbers earn $160 a day and plumbers' helpers earn $100 a day. Twenty
plumbers and helpers earn a total of $2600 a day. How many of each are
there?

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Answer:

Step-by-step explanation:

p and h are number of plumbers and helpers, respectively.

Twenty workers earn a total of $2600

p+h = 20

h = 20-p

160p + 100h = 2600

160p + 100(20-p) = 2600

60p = 600

p = 10

h = 20-p = 10

Ten plumbers and ten helpers.

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