Answer:
Step-by-step explanation:
Let age of Jane = x
Mary's age = x + 1
Sum of both their ages = 15
x + x +1 = 15
2x + 1 = 15
Solution:
Subtract 1 from both sides
2x = 15- 1
2x = 14
Divide both sides by 2
x = 14/2
x = 7
Jane's age = 7
Mary's age = 8
