Use the following corn futures quotes:

$\backslash$table$[[\backslash$table$[[$Contract$],[$Month$]],$Open,$\backslash$table$[[$Corn$],[$High$]],,000$ bus,Settle,Chg$,$Open Int$],[$Mar$,455\mathrm{.}125,457\mathrm{.}000,451\mathrm{.}750,452\mathrm{.}000,-2\mathrm{.}750,597,913],[$May$,467\mathrm{.}000,468\mathrm{.}000,463\mathrm{.}000,463\mathrm{.}250,-2\mathrm{.}750,137,547],[$July$,477\mathrm{.}000,477\mathrm{.}500,472\mathrm{.}500,473\mathrm{.}000,-2\mathrm{.}000,153,164],[$Sep$,475\mathrm{.}000,475\mathrm{.}500,471\mathrm{.}750,472\mathrm{.}250,-2\mathrm{.}000,29,258]]$

a$.$ How many of the July contracts are currently open?

Contracts $,153,164$

b$.$ How many of these contracts should you sell if you wish to deliver $140,000$ bushels of corn in July?

Contracts $,28$