Question

Ten gram of an alloy of metals A and B contains 7.5 gm of metal A and the rest metal B.find the ratio between : (i) the weight of the metals A and B in the alloy (ii) the weight of metal B and the weight of an alloy

Answer 1

(i) weight of metal B = ( 10 - 7.5 ) g
= 2.5 g
Ratio :-

weight of metal A : weight of metal B
=> 7.5 : 2.5
=> 3 : 1
(i) answer = 3:1

(ii)
weight of metal B = 2.5 g
weight of alloy. = 10 g

Ratio :-

2.5 : 10
=> 1 : 4

(ii) answer = 1:4

Answer 2

Answer:

We know that

Total weight of A and B metals = 10 gm A weight - 7.5 gm B weight 

So we get

= 10 – 7.5 

= 2.5 gm

Ratio between the weight of metal B and the weight of the alloy = 2.5: 10

It can be written as

=1025:10

So we get

=25:100

=1:4