17 :)
there is not one
11, 13, 15, 17, and 19 does.
c) 17
The missing number is 21. The reason is because you are adding seven and then subtracting one. You start out with 3 (3 + 7 = 10) then (10 - 1 = 9) then (9 + 7 = 16) and so on.
17 :)
there is not one
1 13 is a prime number.
1
The series 1 6 10 13 15 (1+5=6; 6+4=10, 10+3=13; 13+2=15) is completed by 15+1=16. The answer is 16.
it is but also with a partial number such as (example) 1 and 8/10 or 15 and 13/15
x = missing number x/10 = 15 operate on the equation, doing the same operation to both sides, to isolate x (namely, multiply both sides by 10)
11, 13, 15, 17, and 19 does.
c) 17
The missing number is 21. The reason is because you are adding seven and then subtracting one. You start out with 3 (3 + 7 = 10) then (10 - 1 = 9) then (9 + 7 = 16) and so on.
13 - 2/3 (x) = 3 -2/3 (x) = -10 -2x = -30 x = 15 or 13 - 10 = 3 15 x 2/3 = 10 Answer: 15
13