How many kinds of mathematics enumerations are there in grade three? - Training Enrollment Network

How many kinds of mathematics enumerations are there in grade three?

(1) Big ship: 8 times; Ship: 0 times; (8x50=400)

(2) Large ships: 5 times; Ship: 5 times; (5x(50+30)=400)

(3) Large ships: 2 times; Ship: 10 times; (2x50+30x 10=400)

(4) Large ships: 1 time; Small boats: 15 times; ( 1x50+ 15x30=400)

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