Tư duy logic

A train was running at the speed of 50km/h. A car was running at the speed of 60km/h in the…

Given that A : B = 4 : 3,  B : C = 1 : 2 and A + B +…

John goes 9km west, then goes 12km south. How many km is he now from the start? John đi về…

A store sells $3 vanilla ice-creams and 5$ chocolate ice-creams. On a day, they sold 100 ice-creams in total and…

A clothing store has 2 types of sale promotion. The “Black Friday” program offers 20% off for all items. The…

A deck of 52 cards is divided evenly into 4 suits (spades: ♠, hearts: ♥, diamonds: ♦, clubs: ♣). Andy…

According to the pattern shown below, what is the 20th number in the sequence?2 , 116 , 4 , 115…

There are some chickens and rabbits on a farm. The number of chickens is 12 more than the number of…