The total age of yvonne and samuel is 40 yvonne is 4 years older than samuel find their ages.

Yvonne is 22

Samuel is 18

Step-by-step explanation:

y is age of yvone, s is age of samuel

Write 2 equations:

y + s = 40

y = s + 4

Substitute (s + 4) into y in the first equation:

s + 4 + s = 40

Solve:

2s + 4 = 40

2s = 36

s = 18

Substitute 18 for s in either equation:

y + 18 = 40

Solve:

y = 22

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.