Question

24 kg ingot contains 54% iron ore. another 12kg ingot contains 72% iron ore. both are melted to form a 28kg ingot. what will be the percentage of iron ore in the new ingot

Answer 1

Answer:

60%

Step-by-step explanation:

54% iron ore is present in 24kg ingot. So, (54*24)/100= 12.96kg

Likewise, 72% iron ore is present in 12kg ingot. So, (72*12)/100= 8.64Kg

On applying unitary method,

(24+12)Kg ingot contains (12.96+8.64)Kg iron ore

Therefore, 28Kg would contain (21.6*28)/36= 16.8 Kg iron ore

So, percentage of iron ore in the new ingot is (16.8*100)28= 60%

Hence, 60% is your required answer.