so easy,almost anyone know

Q1:(7x+4/3)-(11/2)=[9+6]/2

Multiply each by 6, we got

[(7x) * 6 + (4/3) * 6] - [(11/2) * 6] = [9 + 6] / 2 * 6

42x + 8 - 33 = 45

42x - 25 = 45

42x = 45 + 25 = 70

x = 70 / 42

x = 1 2/3 (ans.)



Q2.Alice had some $10 banknotes,$20 banknotes and $100 banknotes.the number of $10 banknotes is 3 times that of $20 banknotes.the number of $20 banknotes is 8 times that of $100 banknotes.if Alice had $1500,find the number of $100 banknotes she had.





Let the number of $100 banknotes be a

Thus, number of $20 banknotes is 8a

Thus, number of $10 banknotes is 8a * 3 = 24a



100 * a + 20 * 8a + 10 * 24a = 1500

100a + 160a + 240a = 1500

500a = 1500

a = 3 (ans.)



8a = 8 * 3 = 24 (ans.)



24a = 24 * 3 = 72 (ans.)



Ans. The number of $100 banknotes is 3;

The number of $20 banknotes is 24;

The number of $10banknotes is 72.