Read posting **Sarin participates in school anniversary event part 1 **for school anniversary.

Lower primary school mathematics question LPQ6

At the school anniversary event, Sarin received from his teacher a box of blue, black and red pens to collect guest’s autographs. He found 121 blue pens and 214 more black pens than blue pens in the box. If there were 1 820 pens in the box, how many red pens were there?

Solution:

Model

Number of black pens = 121 + 214 = 335 pieces

Number of red pens = 1 820 -335 – 121 = 1 364 pieces

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