มีที่ถ่วงน้ำหนักอยู่ 3 ชนิดคือ A , B และ C ซึ่งเมื่อลองถ่วงน้ำหนักดูแล้วได้สมดุลดังรูปด้านล่างนี้ั

ถ้าเอาที่ถ่วงน้ำหนักชนิด A จำนวน 4 ก้อนวางไว้บนตาชั่งด้านซ้ายและเอาที่ถ่วงน้ำหนักชนิด B
จำนวน 6 ก้อนวางไว้บนตาชั่งด้านขวา ถามว่าตาชั่งด้านใดจะเอียงต่ำลงและถ้าจะเพิ่มที่ถ่วงน้ำหนัก
ให้สมดุลกันทั้ง 2 ข้าง จะต้องใส่ที่ถ่วงน้ำหนักชนิดใดที่ข้างใด

เฉลย >> ด้านซ้ายจะเอียงลงเพราะหนักกว่าและถ้าจะทำให้สมดุลต้องเพิ่มที่ถ่วงน้ำหนักชนิด C จำนวน
2 ลูกไว้ที่ด้านขวา

ข้อนี้ง่ายมากครับ โดยมีวิธีการคิดดังนี้ึีัครับ
เริ่มแรกให้มองรูปภาพที่ให้มาเป็นสมการก่อนจะได้ว่า
3A = 5B -------เป็นสมการที่ 1
A = B+2C -----เป็นสมการที่ 2
เมื่อนำสมการที่ 1 + สมการที่ 2 จะได้ว่า
4A = 6B + 2C ---เป็นสมการที่ 3
จากสมการที่ 3 นี้ ทำให้สามารถทราบคำตอบได้ดังที่เฉลยไว้ เห็นมั้ยครับว่าไม่ยากเลย

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เหลนเขื่อง

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ข้อนี้ผมคิดได้ด้วยคับ ลุงฮูก ^^

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กัปปะ

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ข้อนี้เด็กประถมอย่างผมก็คิดออกครับ ^^

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ง่ายๆ

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