One hundred families each have 2 fish. Each fish has either one stripe or two stripes. In total, there are 273 stripes. How many one-striped fish are there in total?
Let x be the number of one striped fish and y be the number of two striped fish.
one hundred families have 2 fish ==> x + y = 200
273 stripes total ==> x + 2y = 273
Multiply the first equation by 2:
2x + 2y = 400
x + 2y = 273
Subtract to find that x = 127 and y = 73.
So, there are 127 one-striped fish in total