Let the number be x and if 9+2x = 15 then x equals 3
2*(n+15) = 6n
five times the sum of a number and 8 is -15.
(1+15)*15/2first plus last times number of numbers then divide by two
(15+7) +99
27
The two numbers that solve this problem are 5 and 15. The sum of 5 and 15 is equal to 20, and 15 is indeed 3 times 5.
The sum of 45 and 15 equals 60. 15 x 3 equals 45.
2*(n+15) = 6n
five times the sum of a number and 8 is -15.
Let the number be represented as ( x ). The expression for the sum of 10 times the number and 15 added to 11 times the same number can be written as ( 10x + (11x + 15) ). Simplifying this gives ( 21x + 15 ). Therefore, the sum is ( 21x + 15 ).
(1+15)*15/2first plus last times number of numbers then divide by two
(15+7) +99
27
No because two plus 15 equals 17
19
five
12 & 15