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# Monthly on-line quiz

Mon 10 May, 2021 09:43 am
I've googled, played around with this for days. Any hits, nudges would be greatly appreciated. I don't want the answer. "If 10 = 31, 9 = 44, 4 = 250 and 3 = 353, then which number, in the same context, equals 1000?"
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Type: Question • Score: 1 • Views: 457 • Replies: 2
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engineer

2
Mon 10 May, 2021 10:46 am
@Ramires7,
Looks like a decaying exponential curve. The equation is of the form y = A e^(-kx) where A and k are constants. I will spare you the answer.
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engineer

2
Mon 10 May, 2021 01:12 pm
@Ramires7,
If you want an easier way to do this than running an exponential fit, look at the ratio between the 9 and 10 value (44/31 = 1.42). Notice that it is the same as the ratio between the 3 and 4 value (353/250 = 1.41) . Every time the number goes down by one, the value goes up by around 41.4% give or take due to rounding. So you would guess that if 2, then 353 x 1.414 = ~500.
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