Question

Customer buys a gold jwellery has 90% of gold and rest is copper he is given a bill which amounts 100% charges of gold but brings it to 90% gold amount settles the bill

Answer 1

let the gold jewellery is X and the rest of copper is y then calculate the 90% then out out of hundred percent - 10% of Copper the answer is come

Answer 2

The ratio of gold: copper = 90: 10 when the customer buys gold.

Explanation:

• Customer buys gold jewelry has 90% of gold His one gram will have

a) one gram of gold will contain $\frac{90}{100}$

$= 0.9 g$ of gold.

∴ Number of the mole of gold = $\frac{Mass of gold }{Atomic mass of gold}$

= $\frac{0.91}{97}$

$= 0.0046$

∴Therefore $0.0046$ mole of gold will contain $= 0.0046$ x $6.022$ x $10^{23}$

$= 2.77$ x $10^{21}$ atoms

Now finding the ratio of gold and copper as given is $90$ % so remaining will be 10% copper

(b) Ratio of gold : copper = 90 : 10

(c) Values of customer are responsible behavior and self-awareness.