Have a look at the answer to see how you got on:
20 Golden rings answers
Queen Ratticus can really cause some confusion even
if you use a calculator. Remember, the queen could have paid
one million pounds or £1 for the first, doubling each time. The
second method works out like this:
Cost of each ring:
1. £1
2. £2
3. £4
4. £8
5. £16
6. £32
7. £64
8. £128
9. £256
10. £512
11. £1 024
12. £2 048
13. £4 096
14. £8 192
15. £16 384
16. £32 768
17. £65 536
18. £131 072
19. £262 144
20. £524 288
Not the answer!!
Helpful hint:
· To add up the total, take the last number, double it and then subtract 1.
· eg to add 1 + 2 + 4 + 8, double 8 which is 16, subtract 1 which leaves 15.
· So.... the total for 20 rings is £525288
doubled which is £1 048 576, subtract 1, which is:
£1,048,575.
Answer: £1,048,575
So.... Queen Ratticus paid £48,575
more by paying the second way!
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