Question 1158958

Sally is four times Linda’s age. In 10 years’ time the sum of their ages will be 75.

Determine how old is Sally now.
<pre>As their ages sum to 75 in 10 years' time, their ages now sum to 75 - 2(10) = 75 - 20 = 55 
Let Sally's age be S
Then Linda's is: {{{S/4}}}
We then get: {{{matrix(1,3, S + S/4, "=", 55)}}}
4S + S = 220 ------ Multiplying by LCD, 4
5S = 220
Sally, or {{{highlight_green(matrix(1,6, S, "=", 220/5, "=", 44, years-old))}}}