Question

marks brother is nine years older then mark. their combined ages add up to 33. how old is mark

Answer 1

Answer:

12 yrs old

Step-by-step explanation:

Mark(M)+Brother(B)=33

M=B-9

therefore

(B-9)+B=33

2B-9=33

2B=33+9

2B=42

B=21

21-9=M

M=12

Answer 2

Answer:

Mark is 12 years old

Step-by-step explanation:

a=brothers age

(9+a)+a=33

(9+12)+12

(21)+12=33

a=12

Mark is 12 years old