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 :)

i’m here for points.

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for