\textbf{151.} In dividing a natural number $a$ by a natural number $b$, the quotient is $21$ and the remainder is $37$. How many members of the set of answers that are multiples of $5$ does $a$ have?
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(1) $1$ \hfill (2) $2$ \hfill (3) $3$ \hfill (4) $4$
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