Mathematics
Grade-8
Easy

Question

The cost of 18 apples is $9, the cost of 3.5 dozen of apples is

  1. $21
  2. $27
  3. $24
  4. $30

hintHint:

Use cross-multiplication method to get the answer.

The correct answer is: $21


    N u m b e r space o f space a p p l e s space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space C o s t
space space space space space space space space space space space space 18 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space $ 9
space space 3.5 space d o z e n space equals space 3.5 cross times 12 space equals space 42 space space space space space space space space space space space space space space space space space space space space space space space space space x

B y space c r o s s minus m u l t i p l i c a t i o n space m e t h o d comma
x space equals space fraction numerator 42 space cross times space 9 over denominator 18 end fraction space equals space $ 21

H e n c e comma space t h e space cos t space o f space 3.5 space d o z e n space o f space a p p l e s space i s space $ 21

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