Question 1094466

Write a equation for each statement
:
 alice is twice as old as bob.
a = 2b
 in 5 years time,the total of their ages will be 70.
(a+5) + (b+5) = 70
a + b + 10 = 70
a + b = 70 - 10
a + b = 60
from the 1st equation replace a with 2b
2b + b = 60
3b = 60
b = 60/3
b = 20 yrs is Bob's age
then, obviously
2(20) = 40 yrs is Alice's age now
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:
:
Check this using the 2nd statement
" in 5 years time, the total of their ages will be 70."
45 + 25 = 70