Question

15. 7.5 gm of an alloy of copper and zinc contains 4.5 gm of zinc. What weight of zinc
will be these in 25 gm of the alloy ?​

Answer 1

Step-by-step explanation:

percentage of zinc in 7.5gm of alloy = 4.5/7.5 × 100

= 60%

weight of zinc in 25gm of alloy = 60/100 × 25

= 15 gm

another method

let weight of zinc be x

using proportionality

4.5:7.5 :: x:25

45/75 = x/25

x = 45×25/75

x = 15gm

Answer 2

Answer:

weight of zinc is 15...gm