Answer:63
Step-by-step explanation: H:0=18:12=1.5:1
1.5:1=63:42
Step-by-step explanation:
Let the number of books of Physics be x . Then , No. of chemistry books =3.5x
Now , according to question :
x+3.5x=90
Or , 4.5x=90
Or , x=90/4.5
Or , x=20
Now ,
3.5x= 3.5×20
= 70
Therefore , there were 70 chemistry books and 20 physics books in that question bank.
<h3>
Answer: z=-1</h3>
Step-by-step explanation:
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This question doesn't make sence to me could you explain