Math question? Can anyone answer?
2010-06-13 4:23 pm
Mr. Ng gave his two children money. His daughter received thrice as much as his son. If his daughter bought a toy for $36 and his son received another $18 from his mom, both of the children would have the same amount of money. How much did Mr. Ng give to his son in the beginning?
回答 (6)
2010-06-13 4:54 pm
✔ 最佳答案
let initial daughters money be x and his sons money be ya.t.q
daughter 3y and sons is y
as we assumed 3y = x
again
x-36=y+18
replacing x
3y-36=y+18
2y=54
y=27
x=3y=81
daughter got $81 and son $ 27
2010-06-13 11:47 pm
Assume 'thrice' means twice.
2 * S - 36 = S + 18
2S - 36 = S + 18
2S - 36 - S + 36 = S + 18 - S + 36
2S - S = 18 + 36
S = 54
2 * S - 36 = S + 18
2S - 36 = S + 18
2S - 36 - S + 36 = S + 18 - S + 36
2S - S = 18 + 36
S = 54
2010-06-13 11:46 pm
27.00
2010-06-13 11:35 pm
D=3S
D-36=S+18
3S-36=S+18
2S=54
S=son received=$27
D=daghter received=$81
--------------------------------------
Double Check:81-36=27+18=45
God bless you.
D-36=S+18
3S-36=S+18
2S=54
S=son received=$27
D=daghter received=$81
--------------------------------------
Double Check:81-36=27+18=45
God bless you.
2010-06-13 11:31 pm
You can setup a system of equations:
d=3s
d-36=s+18
3s-36=s+18
2s=54
s=27
So he gave his son 27 dollars originally.
d=3s
d-36=s+18
3s-36=s+18
2s=54
s=27
So he gave his son 27 dollars originally.
2010-06-13 11:30 pm
D - 36 = 18 + S
D = 3S
3S - 36 = 18 + S
2S = 54
S = 27
The son received 27 dollars from Mr. Ng. The daughter received 81 dollars.
D = 3S
3S - 36 = 18 + S
2S = 54
S = 27
The son received 27 dollars from Mr. Ng. The daughter received 81 dollars.
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