Question

Задачапри паянии изделий из жести применяют сплав содержащий 2 части свинца и 5 частей олова Сколько килограммов свинца И сколько килограммов олова в отдельности содержит кусок сплава массой 2 целых девять двадцатых дроби

Answer 1

2 9/20=49/20
2 ч+5 ч=7ч
49/20:7=7/20
(7/20)•2=14/20=7/10 кг
(7/20)•5=7/4=1 3/4 кг

Answer 2

Calculation of Lead and Tin Content in the Alloy

To calculate the amount of lead and tin in the alloy, we need to determine the mass of lead and tin in the given piece of alloy.

The alloy is composed of 2 parts lead and 5 parts tin. This means that for every 2 parts of lead, there are 5 parts of tin.

Let's assume the total mass of the alloy is 2.9/20 kg (2 whole + 9/20 kg).

To find the mass of lead in the alloy, we can use the ratio of lead to tin in the alloy. Since there are 2 parts of lead for every 5 parts of tin, we can calculate the mass of lead as follows:

Mass of lead = (2/7) * Total mass of alloy

Substituting the given values, we get:

Mass of lead = (2/7) * 2.9/20 kg

To find the mass of tin in the alloy, we can use the same ratio:

Mass of tin = (5/7) * Total mass of alloy

Substituting the given values, we get:

Mass of tin = (5/7) * 2.9/20 kg

Let's calculate the values:

Mass of lead = (2/7) * 2.9/20 kg = 0.4143 kg

Mass of tin = (5/7) * 2.9/20 kg = 0.8357 kg

Therefore, the given piece of alloy contains approximately 0.4143 kg of lead and 0.8357 kg of tin.

Please note that the above calculations are based on the assumption that the alloy is perfectly mixed and the ratio of lead to tin is accurate.