Here is the answer 20 + 49 + 71= 140
Add three to it.
131, 7 and 2
"Sum" means you are adding numbers. You can't add one number so there is no sum of 140.
80 add 60 = 140
Ten percent of 140 (140 divided by 10) is 14. 140 divided by one hundred (1.4) times two is 2.8 Add the two to get 16.8
The two numbers that add up to -140 and multiply to 4900 are -70 and -70. Since they are the same number, -70 + -70 equals -140, and -70 * -70 equals 4900.
1.5 and 1.5 easy peasy
140
Cubes of numbers are made by multiplying a number by itself three times.
Three hexagons comprise more than 7 lines so you cannot use only seven numbers, once each, to make all the lines add up to the same number!
-136
The three angles of a triangle add to 180 degrees. If two of them add to 140 degrees then the third must be 180 - 140 = 40 degrees.