Brief introduction to FIX Protocol

HK protocol allows sending new orders and recening execution reports

New orders are requests to the exchange to buy$/$sell shares

Execution reported are messages the exchange sends to confem the receipt of an order, relay trade information, confum changes to an existing ndermject anders

A FIX message it constructed with many tag value strings separated with a 'I character. Each tag value string is represented as TAG$-$VALUE

Tag Definitions

Tag $35$: Message Type$-$Defines the message type. For example

$35-$D is an Order Single D Le this message is a "New Order

$35-3$ is an Execution Report $<>$ eg$.$ You can receive an Execution Report from an exchange for a trade which has been partially or fully filled $($executed$)$

Tag $38$: Order Quantity Defines the number of shares you want to buysell

Tag $44$ Price Price per unit of quantity. antity le$.$ Price per share

Tag ber of shares filled $14$: Cumulative Quantity Total number for the order Tag $15$t$.$ Leaves Quantity Total amount of shares available for further execution

Tag $32$: Last Quantity Quantity of shares bought$/$sold on this trade

Tag $31$ Last Executed Price Price at which shares were bought$/$sold on this trade

Tag $6$: Average Price Calculated average price of all tills on this order

A client sends a "New order message $(35-$DJ to buy $60$ shares at the price of $57$ USED per share $8-$FIX$\mathrm{.}4\mathrm{.}419-159/35-$D$/19-$Buyer$/56-$NYSE$)34-2450/52-26223212-08-12-45111-123456154-1730-60)44-57/59-0155-$BACADRIDGE$(21-1115$

The exchange responds with the following Execution Report$($s$)$

$1$st Trade $($Partial Fil$)$: $-$FIX. $4\mathrm{.}419-159-35-349-8770)$ SeBuyer$)34-245815220221212-00$:$15$:$45$:$11-123456-54-1135-60144-57159-0155-$ADR$/21-1115-08-150-839-1/14-$

What is the expected value of Tag $151($Leaves Quantity$)$ on the $1$st trade?