Pedro le dice a maría si cambias los billetes de 10 € que tienes por billetes de 5 € y los billetes de 5 € por billetes de 10 € seguirás teniendo el mismo dinero cuánto dinero tiene maría si en total son 20 billetes

Maria has 10 bills of 5€ and 10 bills of 10€.

She has a total of 150€.

Step-by-step explanation:

Let be "f" the number of 5€ bills that Maria has and "t" the number of 10€ bills that Maria has.

Set up a system of equations:

Use the Substitution method to solve the system of equations:

1. Solve for "f" from the first equation:

2. Substitute the equation obtained into the second equation and solve for "t".

Then:

3. Substitute the value of "t" into the equation and evaluate:

Therefore, Maria has 10 bills of 5€ and 10 bills of 10 €.

So the total amount of money she has, is:

She has a total of 150€.

24

step-by-step explanation:

i assuming that 2 sides are 6 the other 2 sides are 4 cm so 6 times 4 is 24 : )

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies