50 kg of an alloy of lead and tin contains 60% lead.how much lead must be melted it to make an alloy containing 75% lead
Answers
Answer:
7.5 kg
Step-by-step explanation:
Weight of the alloy = 50 kg
Percentage of lead in alloy = 60%
Weight of lead in the alloy = 60/100 * 50
= 30 kg
Percentage of lead the alloy
must contain = 75%
Weight = 75/100 * 50
= 37.5 kg
Lead to be melted = 37.5 - 30
= 7.5 kg
Answer:
750 grams
Step-by-step explanation:
weight of the alloy =50kg
amount of lead=60%
=60*50÷100
= 3 kg
75% of 50 kg is equal to 3.75 kg
now the amount of lead in the alloy is 3 kg to make it 3.75 kg we need to add 750 grams for 7.5 kg into it