Answer:
11 years old
Step-by-step explanation:
Let Jimmy's age be represented as x. His big brother's age is x+5 and his sister's age is 2x. Adding these gives us 4x+5=29. Solving for x gives us 6. His brother's age is 6+5=11.
11 years old is Jimmy's brother.
Let Jimmy's age be represented as x. His big brother's age is x+5 and his sister's age is 2x. Adding these gives us 4x+5=29. Solving for x gives us 6. His brother's age is 6+5=11.
J=Jimmy's age; S=sister's age=2J; B=brother's age=J+5
.
J+S+B=29
J+(2J)+(J+5)=29
4J+5=20
4J=24
J=6
Jimmy is 6 years old.
B=J+5=6+5=11
ANSWER: Jimmy's brother is 11 years old.
.
CHECK:
S=2J=2(6)=12
Jimmy's sister is 12 years old.
.
J+S+B=29
6+12+11=29
29=29.
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