book Maths Puzzle Numerical Ability

What would be another way to add 1+3+5+7+9+....499=to equal the sum of 62,500?
Only using odd numbers. We need another way to find the sum of all the odd numbers from 1 to 499 and equal 62,500

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book Other Question

Solve the linear system - If the system is inconsistent or dependendent, so state:

14x-13y = 5
28x-26y=10
My son says that the answers involve parabolas, but his teacher has been absent to ask for help, and the test is tomorrow!Help! Thanks!
Given: h=-16tsquared+vt=s, a ball can be