Question 1094466
alice is twice as old as bob.in 5 years time,the total of their ages will be 70. how old is aloce now
<pre>Let Alice's age be A
Then Bob's is: {{{matrix(1,5, 1/2, "*", A, or, A/2)}}}
In 5 years, their ages will sum to 70, so their ages now sum to 60 (70 - 2 * 5, or 70 - 10)
We then get: {{{matrix(1,3, A + A/2, "=", 60)}}} 
2A + A = 120 ------- Multiplying by LCD, 2
3A = 120
A, or Alice is: {{{highlight_green(matrix(1,4, 120/3, "=", 40, "years-old"))}}}