Skip to content / Đến nội dung
ThichHocToan.com

MathNet 2022-part-03 — 197 problems (EN–VI) Question 187

Math Olympiad Vault · MathNet 2022-part-03 — 197 problems (EN–VI)

Question 187

A box contains red, white and blue balls. The number of red balls is an even number and the total number of balls in the box is less than $100$. The number of white and blue balls together is exactly $4$ times the number of red balls. The number of red and blue balls together is exactly $6$ times the number of white balls.
How many balls are in the box?
A) $28$
B) $30$
C) $35$
D) $70$
E) $84$