Here's a mathematical trick. Any number wholly divisible by 3 has the sum of its digits equal to 3 or a multiple of 3.
199 : 1 + 9 + 9 = 19....NOT divisible by 3
209 : 2 + 0 + 9 = 11....NOT divisible by 3
390 : 3 + 9 + 0 = 12....YES, this is divisible by 3
499 : 4 + 9 + 9 = 22....NOT divisible by 3
Note : 390 ÷ 3 = 130
Call one of the numbers x. Since the sum is 390, the other must be 390 - x. Thus we have x(390 - x) = 34304. Solving this quadratic equation, we find the numbers are 134 and 256.
There is an infinite amount of answers to that, such as: 301 + 89 = 390 3 + 387 = 390 150 + 240 = 390
First, you must add all five numbers. If you do so, you should get 390. Then, you divide the sum of the numbers (390) by the amount of numbers you have (5). 390 divided by 5 gives you 78.
39,000,000
They are 210, 330, 390 and 462.
210, 330, 390, 420 and 462
39×5×2
1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390.
330 + 60 = 390
To find the LCM of these numbers, you have to split them into their prime factors: 15 = 3x5 26 = 2x13 The next step would be to identify any common prime factors. However in this case there are none. Thus to find the LCM you just multiply the two numbers together: 15x26 = 390 And so the LCM of 15 and 26 is 390.
390 squared is 390 times 390 = 152,100
The least common multiple of the numbers 30 and 65 is 390.