Answer:
(a) s + g = 400
25 + s = g
(b) see picture attached
(c) s = $187.5, g = $212.5
Explanation:
(a) Let's call
s: money earned by Seiji
g: money earned by Gavin
Together they earned a total of $400. Mathematically:
s + g = 400 (eq. 1)
Gavin eamed $25 more than Seiji. Mathematically:
25 + s = g (eq. 2)
(b) see picture attached
(c) From the picture we can see that:
s = $187.5
g = $212.5