Class 5 Mathematics Notes, Exercise 3, Q.No. 9, Unit-1, Whole Numbers and Operations (New Book/New Syllabus Based on Single National Curriculum Pakistan 2022 and onwards)

Q. There are 145 boxes of pencils each containing 5 pencils. If 48 boxes have blue pencils and the rest have red pencils, find: 

a) the total number of pencils.
b) the number of red pencils.


Solution: 

a) To find the total number of pencils we will multiply 145 by 5



Thus the total number o pencils are 725


b) To find the number of red pencils. we will first find blue pencils by multiplying 48 by 5 and will subtract it from total number of pencils 725



Red Pencils = Total Pencils  - Blue Pencils 

Red Pencils = 725  - 240

Red Pencils = 485 ----------------Ans.

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