Question

the sum of all the natural numbers divisible by 7 between 400 and 700​

Answer 1

Step-by-step explanation:

If the exchange rate of RM 1 is R.s 25 and the exchange rate of $1 is R.s 105, find the exchange rate of dollars for RM 100.

Answer 2

Answer:

23079

Step-by-step explanation:

Here first term(a) = 406, last term(l) = 693, common difference(d) = 7.

Let no. of terms be n.

Therefore, l = a + (n-1)d

=> 693 = 406 + (n-1)7

=> 99 = 58 + n - 1

=> n = 42

So, sum = n/2(a + l) = 21(406 + 693) = 21*1099 = 23079.