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b represents Jonna's brother age
there's a term "older than" so instead of going down like -
we use +
4 years older than... is usually +4
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yes, it is. The brother's age is b. Jonna's age is 4 more than b, or b+4
The sum of the ages is (b) + (b+4), which is 2b+4
So which one do you think it is?
oh i missed that.. thanks for refreshing my memory... I read too fast
I have another question
OH NOW I SAW WHAT HAPPENED!
sum of ages.. we have two people.. which is Jonna and her brother
b is Jonna's brother
b is also Jonna herself
+4 for "4 years older than "and it's also related to Jonna
Jonna is b+4 because b represents the age and +4 is how much older she is compared to b only which is her brother.
b+b+4 and combining like terms is 2b+4. Sorry about earlier xD!