Andy, david and tim altogether have 180 stamps. andy has 20 fewer than david, and tim has 80% of the sum of andy's and david's stamps. how many stamps does each of them have?

Step-by-step explanation:

Alright, lets get started.

Let Andy have A stamps.

Let David have D stamps.

Let Tim have T stamps.

Andy, David and Tim altogether have 180 stamps, means

Andy has 20 fewer than David, means

Tim has 80% of the sum of Andy's and David's stamps, means

Putting the value of D as A+20 in equation 1 and 3

........................equation 5

.......   equation 6

Plugging the value of T in equation 5

It means Andy has 40 stamps.

It means David has 60 stamps.

It means Tim has 80 stamps.

Hope it will help :)

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step-by-step explanation:

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66.666666667%

step-by-step explanation:

divide 150 by 100

divide 100 by 1.5

there you go!

decreased by 33.333333334%