Respuesta :
Answer:
50
Step-by-step explanation:
21 + 4 = 25
25 × 2 = 50
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625!
because sum means the answer coming from addition so, 21+4
21+4=25
and then doubled: 25 x 2
so the answer is 625
because sum means the answer coming from addition so, 21+4
21+4=25
and then doubled: 25 x 2
so the answer is 625