(  {#blank#}1{#/blank#}  )×(   {#blank#}2{#/blank#} )=2400    (  {#blank#}3{#/blank#}  )×(  {#blank#}4{#/blank#}  )=1600

    (   {#blank#}5{#/blank#} )×(  {#blank#}6{#/blank#}  )=2400    (  {#blank#}7{#/blank#}  )×(  {#blank#}8{#/blank#}  )=1600

    (   {#blank#}9{#/blank#} )×(  {#blank#}10{#/blank#}  )=2400    (   {#blank#}11{#/blank#} )×(  {#blank#}12{#/blank#}  )=1600

(  {#blank#}13{#/blank#} )×(  {#blank#}14{#/blank#}  )=2400    (  {#blank#}15{#/blank#}  )×(  {#blank#}16{#/blank#}  )=1600