Question
Two alloys named 'X' and 'Y' contain gold and silver in
the ratio of 3:2 and 7:5 respectively. If 100 grams of X and 120 grams of Y are mixed together, then find the ratio of gold to silver in the final mixture.Solution
Quantity of gold in 100 grams 'X' = 100 × (3/5) = 60 grams
Quantity of silver in 100 grams 'X' = 100 - 60 = 40 grams
Quantity of gold in 120 grams 'Y' = 120 × (7/12) = 70 grams
Quantity of silver in 120 grams 'Y' = 120 - 70 = 50 grams
So, required ratio = (60 + 70) : (40 + 50) = 130 : 90 = 13:9
Ram, Shyam, Rohan, Reeta, and Mukesh are five members of a family who are weighed consecutively, and their average weight is calculated after each membe...
The average cost price of 18 pens (having equal cost price) decreased by Rs.2, when one of the pen is replaced by a new pen having cost price of Rs.74. ...
- The average salary of X, Y, and Z is Rs. 22000 and the average salary of P and Q is Rs. 15000. If the savings of X is 60% of the average salary of all five...
The average marks of 'n' boys is (n + 6) and that of 30 girls is (2n - 10). If the average marks of all students together is 52, find the number of boys.
The average of five consecutive odd numbers is 53. What is the average of the first three numbers among them?
A student's marks were wrongly entered as 65 instead of 45. Due to this, the average marks for the class increased by 1 /3 The number of students in the...
In an examination the average marks of Rohit is 55. If he got 15 more marks in science and 27 more marks in maths then his average would have been 61. F...
Average of 20 numbers is 90. Average of first 8 numbers is 114 while average of last nine numbers is 40. If ninth number is 25% less than the tenth numb...
The average age of three children is 20 years. If their ages are in the ratio 4:5:6. Find the age of the youngest child.
The average score obtained by 23 students in a class test is 68 marks. The top place was shared by 3 people who got the same score. If the lowest score ...