# Sarin’s family in Kluang part 25 (Math Question)

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The blog postings are about the Singapore Math. The readers can learn from the postings about Solving Singapore Primary School Mathematics. The blog presents the Math Concept, the Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids can learn the skills of dealing with the Math Modeling, the 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 Average number and Problem solving.

Story reference :

Math concept reference:

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

Upper primary school mathematics question UPQ585

Sarin’s mother bought some number of liquid soaps at an average price of \$11 from the Kluang Mall. If she were to buy another liquid soap which cost \$37, the average price would then become \$13. How many numbers of liquid soaps did she buy?

Solution:

The math model, The original average price = \$11

The final average price = \$13

The difference = 13 – 11 = \$2

The added liquid soap to be \$13 (The average number)

The remaining dollars = 37 – 13 = \$24

The number of liquid soaps she buy = 24 ÷ 2 = 12