Question
60 grams of an alloy 'A' containing only gold, silver and
copper in ratio 3:2:5 respectively is mixed with 20 grams of alloy 'B' which contains only silver and copper in ratio 3:1 respectively. Find the total ratio of silver to copper in the final mixture.Solution
Quantity of silver in 60 gram of alloy 'A' = 60 × (2/10) = 12 gram
Quantity of copper in 60 gram of alloy 'A' = 60 × (5/10) = 30 gram
Quantity of silver in 20 gram of alloy 'B' = 20 × (3/4) = 15 gram
Quantity of copper in 20 gram of alloy 'B' = 20 × (1/4) = 5 gram
Required ratio = (12 + 15) : (30 + 5) = 27 : 35
A man travels 450 km to his home partly by train and partly by car. He takes 8 hrs 40 minutes if he travels 240 km by train and rest by car. He takes 20...
A was travelling from point X to point Y. He increased his speed by 14 km/h after every hour. He reached his destination in 18 hours. If his initial spe...
‘A’ and ‘B’ started moving towards each other at same time with a speed of 21 km/hr and 15 km/hr, respectively. If the distance covered by ‘A�...
A train service was disrupted due to an accident after a travel of 30 km. The speed was reduced to three-fourths of the original speed. This caused a de...
- Nisha travels the first half of her journey at a speed of 80 km/hr and the second half at the speed of ‘x’ km/hr. If her average speed for the entire t...
A train crosses a platform in 36 seconds and a pole in 24 seconds. If the length of the train is 300 meters, what is the length of the platform?
A man is travelling at a speed of 60 km/h such that he will take 90 minutes to reach his destination. But after completing half the journey, the man too...
<p><p>If a wheel covers a distance of 880 m in 40 rotations, then the diameter of the wheel is?</p></p>
Two individuals, X and Y, travel from point P to point Q at different speeds. X takes 10 hours to complete the journey, while Y takes 12 hours. The diff...
A boy can swim a certain distance downstream in 5 hours and return in 7 hours. If the rate of stream is 4 kmph then what is the speed of boy in still wa...