30ml
We know that
Molarity = n /volume (solution)
M1 = n / V1 -----------------------1
M2 = n / V2 ------------------------2
from 1 and 2
M1/ M2 = V2/ V1
3 /15 = V2 / 150
V2 = (3 * 150) / 15
V2 = 30 ML
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