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Unit 5 exercises in the first volume of fifth grade mathematics
The answer to the eighth question on page 95 of the fifth grade math book:

( 18x 12)/(4+2+2)

=2 16/8

=27 square meters

Safflower: 27x2=54 (square meter)

Green grass: 27x4= 108 (m2)

Yellow flowers: 27x2=54 (square meters)