Bruce collects coins. He collected a total of 250 coins. If 76​% of the coins he collected were​ foreign, how many other coins did he​ collect?

Step-by-step explanation:

So,

→ Number of coins he collected which were foreign = 76% of 250

→ Number of coins he collected which were foreign = × 250

→ Number of coins he collected which were foreign = × 25

→ Number of coins he collected which were foreign =

→ Number of coins he collected which were foreign = 190

Now,

→ Other coins he collected = Total coins - Number of coins he collected which were foreign

→ Other coins he collected = 250 - 190

→ Other coins he collected = 60

Therefore, he collected 60 other coins.

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for