book Maths Puzzle Numerical Ability

Find the next two terms of the geometric sequence 6250, 5000, 4000,...

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book Other Question

One number is 3 more than twice a second number. Their sum is 27. Find the numbers. When the temperature goes up 3degree on the cantorscale, it goes up 8degree
on the Frobenius scale. On both scales, 18degree is the same temperature. How many Frobenius degrees are equal to 30degree Cantor?