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?
Number of black pens = 121 + 214 = 335 pieces
Number of red pens = 1 820 -335 – 121 = 1 364 pieces