Question

How many numbers are there from 300 to 650 which are completely divisible by both 5 and 7?

Answer 1

The least common multiple of 7 and 5 is 35. Therefore the numbers that you want are the multiples of 35 between 300 and 650.

We divide 300 by 35 and, rounding up get 9; this tells us that 35*9 is the first multiple fo 35 after 300. Dividing 35 into 650 and then rounding down (since we don’t want to have any multiples higher than 650) gives 18.

So the multiples of 35 in the range of 300 to 650 are 35*9, 35*10, and so on until 35*18. So, 18–9 + 1 (the +1 is to include the last number) gives us 10 numbers.

Answer 2

Step-by-step explanation:

what number when added 300 give 650 ?