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The third major problem and the third minor problem on page 52 of the second volume of mathematics guidance series of the sixth grade of People's Education Press.
Hello! The following is the answer on page 20 of the series ~ ~

I. (1) Total quantity price Total quantity price.

(2) 4/1= 8/2 =14/3.5 = 20/5 ... = 4 a: their proportions are equal.

(3) The unit price of apple (4) is (5) 16 14.

( 1) 160 240 320 400 480

(2) Attachment 1.

(3) In direct proportion, because distance always changes with time, distance and time can form a proportion.

(4)360 5.5

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