The blog postings are about the Singapore Math. The readers can learn from the postings on Solving Singapore Primary School Mathematics. The blog presenting Math Concept, Math Questions with solutions that teaches in Singapore Primary Schools. You or your kids can learn deal with Math Modeling, Problem Sum from Lower Primary School to Upper Primary School level. This posting is a primary school math question on Ratio and Problem Sum.
You should click and read posting on Sarin learns concept of ratio in school to understand mathematics concept of Ratio.
Upper primary school mathematics question UPQ169
At the Causeway, the number of motorcycles in Woodland Custom Checkpoint was 1/2 the number of cars. There were 220 more cars than motorcycles. After some motorcycles crossed the Woodland Custom Checkpoint, the number of cars in the Woodland Custom Checkpoint was ten times the number of remaining motorcycles. How many motorcycles crossed the Woodland Checkpoint?
Draw a model based on the ratio on motorcycles and Cars at first
The number of motorcycles at first = 220
The number of cars at first = 2 × 220 = 440
The motorcycles and cars = 1 : 10
10 units = 440
1 unit = 44
Motorcycles at the Woodland Custom Checkpoint = 44
Motorcycles crossed the Woodland Custom Checkpoint = 220 – 44 = 176
From the model,
5 units = 220
1 unit = 44
Motorcycles crossed the Woodland Custom Checkpoint = 4 × 44 = 176