exam Maths Puzzle Numerical Ability

In Exercise 18-21, use the following information.

A migrating elephant herd started moving at a rate of 6 miles per hour. One elephant stood still and was left behind. Then this

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The sum of two numbers is 33. Their difference is 11. What are the two numbers?
simplify:14/-2
5(-4)
7-(-3)
-7(4)
x-5=-3
4x=-8
x/2=-8
-2x=6
x/-5=4