In two types of powdered detergent in the ratio of soda and soap dust is 2:19 and 1:11 respectively. If 7 kg of the first type is mixed with 4 kg of the second type find the ratio of soda to soap dust in the new detergent mixture. `1:9` b. `1: 10` c. `9:1` d.`\ 20 :1`

In two alloys the rations of copper to tin are 3:4 and 1:6 respectively. If 7 kg. of the first alloy and 21 kg. of the second alloy are mixed together to form a new alloy, then the ratio of copper to tin in the new alloy is :

In two alloys the ratio of Iron and copper is 4:3 and 6:1 respectively. If 14 kg of the first alloy and 42 kg of the second alloy are mixed together to form a new alloy, then what will be the ratio of copper to iron in the new alloy:

The radii of two soap bubbles are R_(1) and R_(2) respectively. The ratio of masses of air in them will be

Two vessels A and B contain solution of acid and water. In A and B the ratio of acid and water are 7 : 3 and 4 : 1, respectively. They are mixed in the ratio 1 : 2. What is the ratio of acid and water in the resulting solution?

Two bottles contain acid and water in the ratio 2:3and1:2 respectively .These are mixed in the ratio 1:3 What is the ratio of acid and water in the new mixture ?

If the ratio of the sum of the first n terms of two Aps is (7n + 1) : (4n + 27) then find the ratio of their 9th terms.

Two alloys contain iron and lead in the ratio of 4 : 3 and 1 : 6 respectively. 7 kg of the first alloy, 14 kg of the second alloy and some amount of pure iron are mixed to from a new alloy. The resultant alloy has iron and lead in the ratio of 1 : 1 . Find the weight of the resultant alloy.