28 each book 155-15=140 and then 140÷5=28

Let initially he had x No. of apples
ATQ :-
x-40% of x=420
x-2/5x=420
=> 3x=420×5
x= 700

Hope this helps!
Answer:
z³=27
³√z³=³√27
z=3
Step-by-step explanation:
z³=27
³√z³=³√27
z=3
Answer: 13
explain: at the like terms
The answer is 7/27.......