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Give them more time, they eat more pizzas.
Give them more friends, they eat more pizzas.

The time was double (3 days / 1.5 days) and the people was 6x times more (9 / 1.5), thus the number of pizzas should be 2 * 6 times more. That is: 1.5 pizzas * 2 * 6 = 18

Answer: 18 pizzas

One and a half. What is this? Walking Dead?

18

->1.5 teenagers eat 1.5 pizzas in 1.5 days...
=>1.5 teenagers eat 3 pizzas in 3 days...
=>3 teenagers eat 3 pizzas in 6 days...
=>9 teenagers eat 3 pizzas in 18 days...

Answer: 18 pizzas

If one teenager eats one pizza in one and half days, 9 teenagers will eat 18 pizza in 3 days.

1.5 eat 1.5 pizza per 1.5 days

! person eat 1 pizza for 1.5 days
1 person eat 6 slices((9/1.5)*1) for 9 days

So 3 persons eat 18(6*3) for 9 days

here one and half teenagers eat one and half pizza in one and half days ,,, by this one teenager eat in one day and half teenager eat in half day...by this they eat 27 in 3 days

->1.5 teenagers eat 1.5 pizzas in 1.5 days...
=>1.5 teenagers eat 3 pizzas in 3 days...
=>3 teenagers eat 3 pizzas in 3 days...
=>9 teenagers eat 3 pizzas in 3 days...

So, Ans is 3 pizzas in 3 days... Let me explain with an example, 2 horses run 19km in 1 hour... then 10 horses run __57__ km in 3 hours... whether its 2 or 10, it doesn't matter..

54. Consider This:
1.5 people->1.5 pizzas->1.5 days
1.5 people->3pizzas->3 days
1 person->2 pizzas->3 days
1 person->6 pizzas->9 days
9 persons->54 pizzas->9 days
Hope it was clear and satisfactory. :)

1.5 teenagers eat 1.5 pizzas in 1.5 days
9 teenagers eat ?? pizzas     in 3 days
*6                       *6*2                *2
                          1.5*6*2=18

It depends on whether the half a teenager is the half with the mouth or not

27

1.5 teens, 1.5 pizzas, 1.5 days
All are a factor of 1.5
Divide each by 1.5
1 teen, 1 pizza, 1 day
9 teens * 1 pizza per day * 3 days = 27 pizzas eaten by 9 teens in 3 days.

yeah so here it is ..the question says one and a half teenagers eat one and a half pizza in one and a half days. so the total number of pizza given for the one and a half teenager is 1 1/2=3/2. since there is no such thing as a half a teenager we give equal number of the half pizza to the 2 teenagers that is 3/4 each. now if there are 9 teenagers totally then they can eat 9*3/4=27/4. this is in one and a half days. in 3 days it is 27/4 +27/4= 54/4=13.5 pizzas . so 9 teenagers can eat 13.5 pizza in 3 days.

you cannot divide everything by a common factor because there are 3 (odd number of) variables. f.e. when TEENS go UP, PIZZAS remain CONSTANT -> DAYS go DOWN. you can divide only two at a time which would give a ratio of F.E. 1 : 1 : 1.5 rather than 1 : 1 : 1.
having the ratio 1 : 1 : 1.5 multiplied by 9 teens (leaving the pizzas constant for now) would give 9 : 1 : 1.5/9. Now times 18 (to get 3 days) we would get 9 : 18 : 3. this is a clumsy solution but just to show the dividing mistake

1.5 teen = 1.5 pizza = 1.5 days
1 teen = 1 pizza = 1 day
9 teens = 9 pizza/ day x 3 days = 27 pizzas

This is just a basic unit analysis question.

How many pizzas can 1 teenager eat in 1 day?

1.5 pizzas / (1.5 teenagers * 1.5 days) = 1/1.5 = 2/3 (pizzas/(teenagers* days)).

So each teenager can eat 2/3rds of a pizza in 1 day.

But we have 9 teenagers and 3 days so ...

2/3 (pizzas/(teenagers*days)) * 9 teenagers * 3 days = 18

MG

Just do a unit analysis. How many pizzas can 1 teenager eat in 1 day?

1.5 pizzas / (1.5 teenagers * 1.5 days) = 1/1.5 = 2/3 pizza

But we have 9 teenagers and 3 days so...

2/3 pizzas/(teenagers*days) * 9 teenagers * 3 days = 18 pizzas (units work out)

Just do a unit analysis. How many pizzas can 1 teenager eat in 1 day?

1.5 pizzas / (1.5 teenagers * 1.5 days) = 1/1.5 = 2/3 pizza

But we have 9 teenagers and 3 days so...

2/3 pizzas/(teenagers*days) * 9 teenagers * 3 days = 18 pizzas (units work out)

Just do a unit analysis. How many pizzas can 1 teenager eat in 1 day?

1.5 pizzas / (1.5 teenagers * 1.5 days) = 1/1.5 = 2/3 pizza

But we have 9 teenagers and 3 days so...

2/3 pizzas/(teenagers*days) * 9 teenagers * 3 days = 18 pizzas (units work out)

Just do a unit analysis. How many pizzas can 1 teenager eat in 1 day?

1.5 pizzas / (1.5 teenagers * 1.5 days) = 1/1.5 = 2/3 pizza

But we have 9 teenagers and 3 days so...

2/3 pizzas/(teenagers*days) * 9 teenagers * 3 days = 18 pizzas (units work out)

1.5 teenagers : 1.5 pizzas : 1.5 days
1.5: 1.5: 1.5
1: 1: 1
So 1 teenager eats 1 pizza in 1 day
9 teenagers x 1 pizza a day x 3 days = 27 pizzas

One teenager eats a pizza a day, so 9 teenagers eat 27 pizzas in3 days

27