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The Sea & Sun Souvenir Shop is known for its specialty salt water taffy. Every week, Tara fills a gigantic jar with taffy to put in the storefront display. This week, she puts in $400$ pieces of cherry taffy but still has more space to fill. Tara fills the rest of the jar with banana taffy, her favorite flavor. In all, Tara puts $850$ pieces of taffy in the jar.$\newline$Which equation can you use to find how many pieces of banana taffy $b$ are in the jar?$\newline$Choices:$\newline$(A) $b + 400 = 850$$\newline$(B) $b - 400 = 850$$\newline$(C) $400b = 850$$\newline$(D) $\frac{b}{400} = 850$$\newline$Solve this equation for $b$ to find how many pieces of banana taffy are in the jar.$\newline$$\_\_\_\_$ pieces$\newline$