When Arnel was 13 years old, his brother was 27. How many years must pass for Arnel to be four years older than one half as old as hi brother?
2007-03-04 02:24:50 · 7 answers · asked by Alvin A 1 in Science & Mathematics ➔ Mathematics
13 + x = 4 + (27 + x)/2
=> x = 9
2007-03-04 02:28:43 · answer #1 · answered by FedUp 3 · 1⤊ 1⤋
Arnel must be 22 and his brother must be 36
9 years must pass
in 9 years arnel will be 22 and his brother 36
36/2 = 18 + 4 = 22
the reason being 13 + x = (27 + x / 2) + 4
do the algebra x = 9
x = years
2007-03-04 10:32:45 · answer #2 · answered by Mojo 2 · 1⤊ 0⤋
i would use trial and error, continously check each year and see if it is correct eg. arnel=14, his bro=28, wrong
arnel=16, his bro =30 wrong
arnel=18, his bro =32 wrong
arnel=20, his bro =34 wrong (34 divide by 2 =17)
arnel=22, his bro =36 correct (36 divided by 2 = 18 (+4=22))
so 22-13= 9 years
2007-03-04 10:33:34 · answer #3 · answered by benzy 2 · 0⤊ 0⤋
Arnel = 22
His brother =36
9 years
2007-03-04 10:32:52 · answer #4 · answered by greenpotterboy 2 · 1⤊ 0⤋
27/2=13.5
13.5+4=17.5
Arnel is 13
17.5-13=4.5years
2007-03-08 09:46:41 · answer #5 · answered by Anonymous · 0⤊ 0⤋
9 yyears
2007-03-04 10:43:33 · answer #6 · answered by AlgebraNerd 1 · 0⤊ 0⤋
half a year
2007-03-04 10:28:53 · answer #7 · answered by kalloggs40 3 · 0⤊ 1⤋