Ten hours. Subtract the smaller number from the larger. Then subtract the remainder from 12.
You get 50.
Subtract two, multiply by two, subtract one. :)
4. Reverse the process to find the number: 7 is added to the product of 3 and a number to get 19. The last thing done is add 7; the reverse process of add is subtract, so subtract 7, leaving: The product of 3 and a number is 19 - 7 = 12. The reverse process to multiply (product) by 3 is divide, so divide by 3, leaving: a number is 12 ÷ 3 = 4
== == 7/12 - 11/12 = -4/12 or -1/3.
19 does.
13 - 12 = 12
7/12 - 1/4 = 7/12 - 3/12 = 4/12 = 1/3.
9
When you subtract 16 2/3 from 7 7/8 you will get 211/24 as a mixed number.
You can't. For example if your equation is: 2x+7=12 then you will subtract 7 by itself, then subtract 7 from 12. You then get 2x=5. You will then divide 5 by 2 and you will get x=2.5 as your final answer.
7 is an odd number. If you subtract an odd number minus an even number, you will always get an odd number. There is no way to avoid this.