Question

A shop stocks 30 bottles of shampoo. Felix buys 2/5 of bottles and Anita buys 3/10 of the bottles. How many bottles of shampoo does the shop have left?

Answer 1

Answer:
9 bottles of shampoo left.
Why?
Let x represent the number of bottles of shampoo that the shop has left.
Let f represent the number of bottles of shampoo Felix buys.
Let a represent the number of bottles of shampoo Anita buys.
This means that x = 30 - (f + a)
So, f = (2/5)*30
f = 12
So, a = (3/10)*30
a = 9
Plug it into our equation;
x = 30 - (f + a)
x = 30 - (12 + 9)
x = 30 - 21
x = 9
Therefore, the shop has 9 bottles of shampoo left.

Answer 2

Felix : 2/5 of 30 is 12. Anita : 3/10 of 30 is 9. 12 + 9 = 21. 30-21=9. The shop will have 9 bottles of shampoo left. Bit messy but hope you understand lol <3