A salesman sold twice as much pears in the afternoon than in the morning. If he sold $420 kilograms of pears that day, how many kilograms did he sell in the afternoon?	Choose the correct choice from the following answers:
A) 120
B) 180
C) 240
D) 280
E) 320

Rationale: "3 x = 420 x = 140 therefore , the salesman sold 140 kg in the morning and 2 ⋅ 140 = 280 kg in the afternoon . so answer is d ."
Answer: D