Answer:
Joan weighs 47.5 kg, while her sister Annie weighs 44.5 kg.
Step-by-step explanation:
Let x be Annie's weight in kg. Since Joan weighs 3 kg more than her sister, therefore her weight is (x + 3) in terms of x.
Solution: x + x + 3 = 92
2x + 3 = 92
2x = 92 - 3
2x = 89
x = 89/2 or 44. 5 kg ( Annie's weight )
x + 3 = 44. 5 + 3 = 47. 5 kg ( Joan's weight )
