Answer:
21
Step-by-step explanation:
7 times 3 is 21
7 x 1 = 7
7 x 2 = 14
7 x 3 = 21
7 x 4 = 28
7 x 5 = 35
like wise add 7 to the answer.
Addition of answer with the number added with itself before is nothing but multiplication.
