Give it a shot. Very tricky writing question.

The correct answer is C

I have found you very useful and interesting piece of information. You will definitely benefit from it.

Here’s 1000 digits of pi( couldn't find it on my keyboard)

3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989

Enjoy it 🗿🗿🗿

You know I worship such information because Math is what I genuinely love.

#offtopic
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Drop your choice and reasoning

Desmos fell in love with me 🗿

A. Any explanations?

80% is proportion
so only 2 ways of solving that problem exist:
1. adding more silver, so the proportion goes up
2. decreasing the weight — silver's 74% becomes higher as the overall weight goes down

he chose 2nd