Question

Q.4. An alloy contains only zinc and copper. One such alloy weighing 15-gm
contains zinc and copper in the ratio of 2: 3 by weight. If 10 gm of zinc is added
then find what amount of copper has to be removed from the alloy such that
the final alloy has zinc and copper in the ratio of 4:1 by weight?
A. 5gm
B. 3gm
C. 4gm
D. 1gm​

Answer 1

Answer:

5 gram

Step-by-step explanation:

sol.1st alloy zinc=2/5×15=6

copper=3/5×15=9

let copper to be removed=x

then,

6+10/9-x=4/1

=16=36-4x

=x=5gm.