# Sarin, Hairu and Fatimah make greeting cards for Mother’s Day part 13 (Math Question)

Standard

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, Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids will learn to deal with Math Modeling, Problem Sum from Lower Primary School to Upper Primary School level. This posting is an upper primary school math question on Ratio.

You can read the story of Sarin and the siblings making greeting cards for their mother by reading the posting on Sarin, Hairu and Fatimah make greeting cards for Mother’s Day in Welcome page.

You can read the posting on Sarin learns concept of ratio in school to understand the concept of Ratio.

Upper primary school mathematics question UPQ225

Sarin makes another greeting card using a rectangle card and painted with different colours. The ratio of the area of M to the area of R is 2 : 1. The ratio of the area of R to the area of P is 5 : 2. If P is 1/3 of Q, find the ratio of the area of M to the area of N to the total area of the rectangle.

Solution:

From the given conditions of the area ratio

R : P = 5 : 2

P : Q = 1 : 3 = 2 : 6

We have

R : P : Q : (R + P + Q) = 5 : 2 : 6 : 13

Area of (R + P + Q) = Area of (M + N)

Since

M : R = 2 : 1 = 10 : 5

M : N : Total area = 10 : 3 : 26