Answer :
22.5 grams of zinc is present in 31.5 gram alloy
Solution:
Given that,
Ratio of weight of Tin and zinc in a alloy is 2 : 5
Therefore.
Weight of tin : Weight of zinc = 2 : 5
Let the weight of tin be 2x
Let the weight of zinc be 5x
How much zinc is there in 31.5 gram of alloy ?
Therefore, total weight of alloy is 31.5 gram
Weight of tin + Weight of zinc = 31.5
[tex]2x + 5x = 31.5\\\\7x = 31.5\\\\x = \frac{31.5}{7}\\\\x = 4.5[/tex]
Weight of zinc = 5x = 5(4.5) = 22.5
Thus 22.5 grams of zinc is present in 31.5 gram alloy