exam Maths Puzzle Numerical Ability

One number is 6 less than another number. Their sum is 20. Find the greater number?

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exam Other Question

By looking at two linear equations, how can you tell that the corresponding lines are parallel?

Please kelp me. Thankyou kindly can someone please explain how to do this??!?! I dont care for the answers I just want to understand how to deal with this!
thanks in advance..
Determine S20 for the arithmetic s