Sarin participates in school anniversary event part 18 (Math Question)

Standard

The blog postings are about the Singapore Math. The readers can learn from the postings about Solving Singapore Primary School Mathematics. The blog presenting the Math Concept, Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids can learn the skills to deal with Math Modeling, Math Problem Solving and Problem Sum from Lower Primary School to Upper Primary School level after reading the blog postings. This posting is an upper primary school math question on Percentage and Problem Sum.

Read the posting on Sarin participates in school anniversary event part 1 for story on school anniversary.

Read the posting on Sarin learns Average Number, Percentage and and Charting in school (Math Concept) to understand the concept of Percentage.

Challenge yourself with the question before look out for the given solution‼

Upper primary school mathematics question UPQ355

Sarin was given some red and green armbands to use by the team to identify their work groups. 60% of the armbands were red and the rest were green. He issued some of the red armbands to a work group and the percentage of the armbands which were red decreased by 40%. He then had 760 red armbands and green armbands left. How many red armbands did he issue?

Solution:

The red armbands was reduced by 40%

Workout to be 40% × 60% = 24% of the total armbands issued

The model

The percentage of armbands left = 36 + 40 = 76%

Total number of armbands left = 760

Set 1 unit = 1%

76 units = 760

1 unit = 10 armbands

The number of red armbands issued = 24 × 10 = 240