Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
527 views
in Aptitude by (114k points)
closed by
In two alloys the ratios of copper to tin are 3 : 4 and 1 : 6 respectively. If 7 kg of the first alloy and 21 kg of the second alloy are mixed together to form a new alloy, then the ratio of copper to tin in the new alloy is:
1. 3 : 11
2. 1 : 4
3. 3 : 7
4. 4 : 11

1 Answer

0 votes
by (115k points)
selected by
 
Best answer
Correct Answer - Option 1 : 3 : 11

Given:

The ratio of copper to tin of 1st alloy = 3 : 4

The ratio of copper to tin of 2nd alloy = 1 : 6

Weight of 1st alloy = 7 kg

Weight of 2nd alloy = 21 kg

Calculation:

The quantity of copper in 7 kg alloy = (3/7) × 7 = 3 kg

The quantity of tin in 7 kg alloy = (4/7) × 7 = 4 kg

The quantity of copper in 21 kg alloy = (1/7) × 21 = 3 kg

The quantity of tin in 21 kg alloy = (6/7) × 21 = 18 kg

New alloy = 1st alloy + 2nd alloy 

Total quantity of copper in new alloy = 3 + 3 = 6 kg

Total quantity of tin in new alloy = 4 + 18 = 22 kg

The ratio of copper to tin in new alloy = 6 : 22 = 3 : 11

 ∴ The ratio of copper to tin in the new alloy is 3 : 11.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...