1. 60 kg of an alloy A is mixed with 100 kg of alloy B to make a new alloy. If alloy A has lead and tin in the ratio 3:2 and alloy B has tin and copper in the ratio 1:4, then the amount of tin in the new alloy is (b)
a. 36 kg
b. 44 kg
c. 53 kg
d. 80 kg
2. The number of candidates writing three different entrance exams is in the ratio 4:5:6. There is a proposal to increase these numbers of candidates by 40%, 60%, and 85% respectively. What will be the ratio of increased numbers? (d)
a. 14:15:16
b. 12:15:19
c. 13:19:21
d. none of these
3. If 2A = 3B = 4C, then A : B : C is (c)
a. 2:3:4
b. 4:3: 2
c. 6:4:3
d. 3:4:6
4. The ratio of present ages of Neha and Sneha is 7:8. Four years hence, this ratio becomes 9:10. What is Neha’s present age? (b)
a. 18
b. 14
c. 17
d. Data inadequate
5. An alloy of zinc and copper contains the metals in the ratio 5 : 3. The quantity of zinc to be added to 16 kg of the alloy so that the ratio of the metal may be 3:1 is (d)
a. 2 kg
b. 4 kg
c. 3 kg
d. 8 kg