In a kingdom, the king donates wheat grains equal to 10 times his weight on his birthday. (c) How much weight did he gain in a year until this birthday?
(c) Weight gained in a year:
Given: Current weight = 80 kg (from part a) Last year's weight = 78 kg (from part b)
Formula: Weight gained = Current weight - Last year's weight
Calculation: Weight gained = 80 kg - 78 kg = 2 kg
Answer: The king gained 2 kg in a year.
Explanation
The chapter presents a word problem. From parts (a) and (b), the king's current weight is 80 kg and his weight last year was 78 kg. Weight gained = Current weight - Last year's weight = 80 kg - 78 kg = 2 kg.
Solution Steps
Step 1: Current weight = 80 kg (from part a)
Step 2: Last year's weight = 78 kg (from part b)
Step 3: Weight gained = 80 kg - 78 kg = 2 kg