Question

A man weighs 175 lb. Express his weight in kgs. It is given that 1 kg = 2.205 lb.

Answer 1

Hint: This is a simple question of multiplication and division. We are given that 1 kg = 2.205 lb and to solve this we have to express lb into kgs so we will find out using the data given that how much kgs is equal to 1 lb. Then after finding this we will simply multiply the obtained data with the given data i.e. 175 lb to find the correct answer.

Complete step by step answer:
We are given that a man weighs 175 lb. and we have to find his weight in kgs,
It is also given that 1 Kg = 2.205 lb.,
So, to solve this we will first try to find the amount kgs that 1 lb contains,
We can find this as follows,
$$\begin{array}{rl}& 2.205lb=1kg\\ & 1lb={\displaystyle \frac{1}{2.205}}kg\\ & 1lb={\displaystyle \frac{1}{2.205}}\times 1kg\\ & 1lb=0.4535kg\end{array}$$
Hence we get, $$1lb=0.4535kg$$
Now we have to find the weight of the man in kg using this data,
We have weight of the man as,
= 175 lb,
So we get
1 lb = 0.4535 kg
Multiplying with 175 on both sides,
175 lb = $175\times 0.4535kg$
175 lb = 79.3625 kg.

Hence if a man weighs 175 lbs then his weight in the kg would be given as 79.3625 kgs.

Note: You can also solve this question by simply dividing the given amount in the lbs by 2.205, that would also be correct. But if this question has to be solved in a subjective exam then the mentioned solution and approach is a better way to solve it. Also read the question carefully before solving it because some students might make mistakes like directly multiplying 175 with 2.205 to find an answer but that is wrong.