Question

. Mark's brother is five years older than Mark. Their combined ages add up to 23. How old is Mark?

Answer 1

Answer:

Marks age = 9

Marks brothers age = 9 + 5

                                  = 14

Step-by-step explanation:

Mark - x

Marks brother = x + 5

= x + x + 5 = 23

Add and substitute..

2x = 23 - 5

x = 18/2

x = 9

Marks age = 9

Marks brothers age = 9 + 5

                                  = 14

Answer 2

Answer:

mark is 9 years old

Step-by-step explanation:

mark= x

brother= x+5

combined ages= x+(x+5)

23=2x+5

23-5=2x

18/2=x

9=x

mark is 9 years old

plz..mark as brilliantist