Question

By what number (-9)"should be multiplied so that the product may be equal to (-1
The product of two rational numbers is 5/18. If one of them is -3/20, find the other
SEC-C(3x5=15)​

Answer 1

• (let unknown number be =x
• x×-3/20=5/18
• x=5/18÷-3/20
• x=5/18×20/-3
• x=5/9×10/-3
• x=50/-27)
• let unknown number be =y
• let unknown product be =z
• -9×y=z
• z=x
• -9×y=50/-27
• y=50/-27÷-9/1
• y=50/-27×1/-9
• y=50/243