# Sarin’s father crossing the Causeway part 13 (Math Question)

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The blog postings are about the Singapore Math. The readers can learn from the postings on Solving Singapore Primary School Mathematics. The blog presenting the Math Concept, the Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids can learn to deal with the Math Modeling, the Math Problem Solving and 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 Ratio and Problem Sum.

Read the posting on Sarin’s father visits his friend in JB town to know about JB town as well as read the posting on Sarin’s father crossing the Causeway to know about the Johor-Singapore Causeway.

You should read posting on Sarin learns concept of ratio in school to understand mathematics concept of Ratio.

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

Upper primary school mathematics question UPQ422

At the Causeway, there are an equal number of cars and motorcycles queueing at Woodlands custom check point. The total number of wheels of these cars and motorcycles is 1500. How many vehicles are there in the queue?

Solution:

Using Grouping method

A car has 4 wheels and a motorcycles has 2 wheels

Since there is same number of cars and motorcycle

By grouping a car and a motorcycle as a set

The number of wheels in a set = 4 + 2 = 6

Total number of sets = 1500 ÷ 6 = 250

The total number of vehicles in the queue = 2 × 250 = 500

Alternative solution:

Approach the question using ratio

The number of cars and the number of motorcycles are equal

In ratio,

Cars : Motocycles = 1 : 1

Since a car has 4 wheels and a a motorcycle has 2 wheels

In term of ratio based on number of wheels

Car wheels : Motorcycle wheels = 4 : 2 = 2 : 1

3 units = 1500

1 unit = 500

The number of wheels for motorcycles = 500

The number of motorcycles = 500 ÷ 2 = 250

The total number of vehicle in the queue = 2 × 250 = 500