(5.3*3.75+3.75*3.5)/2.2

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(5.3*3.75+3.75*3.5)/2.2

(5.3*3.75+3.75*3.5)/2.2
(5.3*3.75+3.75*3.5)/2.2

(5.3*3.75+3.75*3.5)/2.2
=3.75*(5.3+3.5)/2.2 =3.75*8.8/2.2 =8.8/2.2*3.75 =4*3.75 =15