Asked by Anonymous666_3
A boy was building up his collection of marbles.He decided to increase his collection by 12 a week.After 13 weeks he had 161 marbles.
(i) How many marbles did he have after 4 weeks?
(ii) After how many complete weeks will he reach his target of 809 marbles?
(i) How many marbles did he have after 4 weeks?
(ii) After how many complete weeks will he reach his target of 809 marbles?
Answers
Answered by
Steve
161 = 13*12 + 5
(i)
after 4 weeks he had 5 + 4*12 = 53
(ii)
n/2 (5+12(n-1)) = 809
n ≈ 11.7
So, after 12 weeks he had more than 809 marbles
(i)
after 4 weeks he had 5 + 4*12 = 53
(ii)
n/2 (5+12(n-1)) = 809
n ≈ 11.7
So, after 12 weeks he had more than 809 marbles
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