Mariano delivers newspapers. He always puts 3/4 of his weekly earnings in his savings account and then divides the rest equally into 3 piggy banks for spending at the snack shop, the arcade, and the subway.

a. What fraction of his earnings does Mariano put into each piggy bank?

b. If Mariano adds $2.40 to each piggy bank every week, how much does Mariano earn per week delivering papers?

a. Fraction of earnings that Mariano put into each piggy bank is 1/12

b. Mariano earns $28.8

Step-by-step explanation:

Mariano divides his earning in a saving account and 3 piggy banks.

First, we have to know the fraction that we divide in the 3 piggy banks.

Piggy banks = Total earning-Saving account

Saving account 3/4,

Total earning is 1

to rest both term we have to get the same denominator, so we can say that the total earning is 4/4

Piggy banks = 4/4-3/4 = (4-3) / 4=1/4

Piggy banks = 1/4

Each piggy bank will be 1/3 of that 1/4

1/3 x 1/4=

For fraction multiplication, multiply the numerators and then multiply the denominators to get

1*1/3*4=1/12

This fraction cannot be reduced.

b. Mariano adds $2.40

1/12 is 2.40

total earning is?

We use cross-multiplication

a/b=c/d replacing (1/12) / 2.40 = 1/?

So, the total earning (?) is 1 x 2.40 / (1/12)

= 2.40 x 12=$28.8