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DE ACUERDO A LOS DATOS SE TIENE:
A × √B
LUEGO:
(5/7)√49 = (1/4)√B
20 = √B
400 = B
ESO ES TODO, SALUDOS..................
5/7×√49= 1/4×√B
5/7×7=1/4×√B
5=1/4×√B
5=√B/4
20=√B
20²=B
400=B
Rpta:400