exam Maths Puzzle Numerical Ability

A researcher randomly selects and interviews fifty male and fifty female teachers. What sampling technique is used?
a. cluster
b. stratified
c. random
d. systematic
e. convenience

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exam Other Question

Answer the following using graphing method

x+3y=4
x=3
One number is 3 more than half of a second number. If the average of the two numbers is 15 1/2, find the smaller of the two numbers.