exam
Maths Puzzle
Numerical Ability
The sum of two numbers is 21. the first number is 3 more than twice the second. set up a system of equations and solve it by elimination to find the numbers.
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exam Other Question
An old-model machine can stamp 1000 parts in 4 hours, but his helper would require 6 hours to do it alone. How long will it take them to do it if they work together.
2/5=5/10n+2