Mr. Aubrey who works as a Jeweller, makes either silver or gold pendan

Question

Mr. Aubrey who works as a Jeweller, makes either silver or gold pendants. Mr. Aubrey has 150 troy ounces of gold and 450 troy ounces of silver. Is this much of weight of gold and silver enough to make at least 100 pendants?

(1) Each silver pendant is made of 4.5 troy ounces of silver and then coated with 0.5 troy ounce of gold. 
 (2) Each gold pendant is made of 4.5 troy ounces of gold.

dhart · Answer

both look suff optionc

madsb18 · Answer

makes only silver or gold pendants.

Gold = 150 TO. Silver 450 TO.

1. 4.5 TO per silver pendant. Max silver Pendant = 100. Needs 50 OT of gold. Yes possible. Suff.
2. 4.5 TO of gold/pendant. 150/4.5 + dont know about silver pendants = may or may not be atleast 100. In Suff.

A.

SuchTask · Answer

This question flips the order of silver and gold twice. This is atypical of GMAT questions.

LessGoRahul · Answer

This is a  Data Sufficiency  question. We need to determine whether the given information is enough to answer:
 
Given
 
 Gold =  150 troy oz  
 Silver =  450 troy oz   
 
Statement (1)
 
For  100 silver pendants :
Silver required:
100(4.5)=450 oz100(4.5)=450	ext{ oz}
Gold required:
100(0.5)=50 oz100(0.5)=50	ext{ oz}
He has:
 
 Silver = 450 oz ✅ 
 Gold = 150 oz ✅  
So he  can definitely make 100 silver pendants .
Therefore,  Statement 1 alone is sufficient.  ✅
 
Statement (2)
 
He has 150 oz of gold.
Number of gold pendants:
1504.5=33.33\frac{150}{4.5}=33.33
So he can make only  33 complete gold pendants , not 100.
But here's the important point:  we don't know how much material a silver pendant requires. 
He has 450 oz of silver, but without knowing the silver pendant's requirements, we cannot determine whether he can make 100 silver pendants.
Therefore,  Statement 2 alone is NOT sufficient.  ❌
 
Final Answer:  A — Statement (1) alone is sufficient. 
   Statement 
 Sufficient? 
 Why? 
 
   1  
 ✅ Yes 
 Can make exactly 100 silver pendants 
 
   2  
 ❌ No 
 Can make only 33 gold pendants, but silver pendant requirements are unknown

A\boxed{	ext{A}}
🔑 Important Data Sufficiency trick
Don't ask  "Can I calculate something?" 
Ask:
 
For Statement 2, knowing he can make only 33 gold pendants  doesn't tell us whether he can make 100 silver pendants , so it isn't sufficient.

Mr. Aubrey who works as a Jeweller, makes either silver or gold pendan

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Statement	Sufficient?	Why?
1	✅ Yes	Can make exactly 100 silver pendants
2	❌ No	Can make only 33 gold pendants, but silver pendant requirements are unknown

GMAT Data Sufficiency (DS) Questions

Mr. Aubrey who works as a Jeweller, makes either silver or gold pendan

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