Math Help!!!!!!!!!

[jahexom]

My daughter needs help with her math home work. Here is the problem:

Two mothers and two daughters divided $21 in dollar bills evenly among themselves. Each recieved an equal number of dollar bills. How could this be?

Please help me.

 

[EthansMom]

My daughter needs help with her math home work. Here is the problem:

Two mothers and two daughters divided $21 in dollar bills evenly among themselves. Each recieved an equal number of dollar bills. How could this be?

Please help me.

My thinking is that the bills are in different denominations. The problem doesn't say that the bills are all "one" dollar bills. I'm assuming that there are a mix of 1s, 2s, and 5 dollar bills such that each person can have the same number of bills.

 

[jahexom]

21 is not evenly divided by four so i'm am almost definitly sure that it must be a trick question, but i'm not sure how to figure out the answer.

 

[EthansMom]

Actually, I was thinking about this and had an "AH-HA" moment. There are 2 Mothers and 2 Daughters, right? So, how about if one of the Mothers is also a Daughter?

Say, you have Grandma (who is a Mother), Mom (who is a Mother and a Daughter), and Granddaughter (who is only a Daughter). You only have three ladies, they can split the money, with each having a $5 bill and two $1 bills.

 

[jahexom]

thanks! that sounds right.

 

[daisyduck123]

My thought is....you have 4 people...the bills are a : 10, 5, 5, & 1.

one person gets the 10 dollar bill
one gets a 5
one gets a 5
the last gets a 1 dollar bill---

Each has 1 bill in her hand!!!

 

[jahexom]

they each recieved the equal amount of dollar bills

 

[HaleyB]

Geesh,
I know we are trying to make kids think outside the box but that question would have made me cry when I was a kid. I agree with the Grandmother Mother/Daughter Daughter answer. But then again four bills ($10, $5, $5, $1) could be it too. Maybe they are just wondering what the kids will come up with...

 

[jackandsally]

My thought is....you have 4 people...the bills are a : 10, 5, 5, & 1.

one person gets the 10 dollar bill
one gets a 5
one gets a 5
the last gets a 1 dollar bill---

Each has 1 bill in her hand!!!

This could be it, the question did say equal amount of bills not equal amount of money. So they would each have 1 bill but different amounts of money.

 

[sara74]

I'm with the Grandmother/Mother/Daughter thing but I would say that they each had 7 ones rather than a 5 and 2 ones. That way you are still dealing with dollar bills like the original question was worded.

Love this stuff! I'll have to try to trick DH with this later tonight!

 

[mickeyfan2]

The bills are $10, $5, $5 and $1. They each get a bill but not the same denomination.

 

[jahexom]

they each recieved the equal amount of dollar bills

 

[hopesmommy]

The answer is the grandmother, mother/daughter, daughter. You have two mothers and two daughters and they each get an equal amount of the bills and the same dollar amount.

 

[runwad]

Don't you just love kids math now a days? Math was my worst subject had to work my butt off to get a B. Luckily my 10DD is gifted in math and can help her younger sister and brother, when her mother can't.

 

[jahexom]

Ok. Here is my second and hopefully last question:

Keri's father, Bill, was a baker. Out of his usual morning batch of chocolate chip cookies, Bill burned his first two dozen. He gave half of what was left to Keri to take to school. He wrapped up half of the remaining cookies and gave them to the gas station crew next door. He gave half of what was left to the policeman on the beat. If Bill had only 7 cookies left, how many were in the batch of chocolate chip cookies?

 

[daisyduck123]

I think I got it....

He gave Keri 28 cookies.

He gave the gas station 14

He gave 7 to the pokiceman

He had 7 left.

Add it all up ----56 non-burned cookies

80 cookies including the burned ones.

 

[mickeyfan2]

Ok. Here is my second and hopefully last question:

Keri's father, Bill, was a baker. Out of his usual morning batch of chocolate chip cookies, Bill burned his first two dozen. He gave half of what was left to Keri to take to school. He wrapped up half of the remaining cookies and gave them to the gas station crew next door. He gave half of what was left to the policeman on the beat. If Bill had only 7 cookies left, how many were in the batch of chocolate chip cookies?

X is the original number of cookies.

He burns 24 cookies

Keri takes 1/2(X-24) = X/2-12 cookies to school

He has X-24-(X/2-12) = X-X/2-24+12 = X/2-12 cookies left

He wraps up 1/2(X/2-12) = X/4 -6 cookies and give to gas station crew.

He has X/2-12-(X/4-6) = X/2-X/4-12+6 = X/4-6 cookies left

He gave 1/2(X/4-6) = X/8 - 3 cookies to the Police

He has X/4-6-(X/8-3) = X/4-X/8-6+3 = X/8-3 cookes left.

X/8 - 3 = 7
X/8 = 10
X = 80 cookes



Now to see if the numbers work:

24 burned cookies
Keri = X/2-12 = 80/2-12 = 40-12 = 28 cookies
Crew = X/4 -6 = 80/4-6 = 20-6 = 14 cookies
Police = X/8 - 3 = 80/8 - 3 = 10-3 = 7 cookies
Left = 7 cookies

24+28+14+7+7 = 80 cookies

 

[grlpwrd]

Just curious...what grade is your dd?

 

[jahexom]

7th grade

 

[jahexom]

I'm sorry, but I have another math problem. I'm just not very good @ math and she needs to get ready for bed and her math is due tomorrow. So here is yet another math problem:

Spread the word! It is Grand Opening Day at the Jeanery! Every 5th customer will recieve a coupon for a free pair of jeans, and every 7th customer will recieve a coupon for a free sweater. If 400 customers come in on opening day, how many will leave with both a pair of jeans and a sweater?