bySayantani Barman Experta en el extranjero
Question: Water consists of hydrogen and oxygen, and the approximate ratio, by mass, of hydrogen to oxygen is 2 : 16. Approximately how many grams of oxygen are there in 144 grams of water?
- 16
- 72
- 112
- 128
- 142
Answer:
Approach Solution (1):
Since the ratio, by mass, of hydrogen to oxygen is 2 : 16, then oxygen is \(\frac{16}{(2+16)}=\frac{8}{9}\) of mass of water.
Therefore, there are \(\frac{144*8}{9}=128\) grams of oxygen in 144 grams of water.
Correct option: D
Approach Solution (2):
Given ratio: 2 : 16 = 1 : 8 = Hydrogen : Oxygen
Let the quantity = x (by mass)
x + 8x = 144
x = 16
Amount of oxygen = 144 – 16 = 128
Correct option: D
“Water consists of hydrogen and oxygen, and the approximate ratio, by mass, of hydrogen to oxygen is 2 : 16. Approximately how many grams of oxygen are there in 144 grams of water?”- is a topic of the GMAT Quantitative reasoning section of GMAT. This question has been taken from the book “GMAT Official Guide Quantitative Review”. To solve GMAT Problem Solving questions a student must have knowledge about a good amount of qualitative skills. The GMAT Quant topic in the problem-solving part requires calculative mathematical problems that should be solved with proper mathematical knowledge.
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