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All the answers on pages 26 and 27 of "Synchronous Guidance Training and Detection", the second volume of fifth grade mathematics.
I didn't report the first question;

2: 16 * 6 * 0.74 = 7 1.04 (kg)

Three: 720 tons =720 cubic meters

720/ 18/8 = 5 (m) BR/> 4: 50 * 25 *1.2/2.5/60 =10 (hour)

Formula: 42- 1 * 2 = 40 (cm)

40 * 40 * 40 = 64000 (cubic centimeter)

Development (II): 24 *(240/2/24)* 8 = 960(CC)

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