book Maths Puzzle Numerical Ability

i need help!


1) Use the arithmetic sequence of numbers 1, 3, 5, 7, 9,…to find the following:
a) What is d, the difference between any 2 terms?
Answer:
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book Other Question

. Solve the following system by addition. If a unique solution does not exist, state
whether the system is inconsistent or dependent.
x + 5y = 10
-2x - 10y = -20
3x + 3y - 6z?