exam Maths Puzzle Numerical Ability

find the sum of the first 19 terms of the arithmetic series in which a1=2 and d=4.
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exam Other Question

one number is equal to two times a second number. two time the first number plus two times the second number is 24. if you let x stand for the first number and y for the second, what are the two number. Two cars leave towns 230 km apart at the same time, traveling directly toward one another. One car travels 15km per hr slower than the other. They pass one another 2 hours later. What are their speeds?