**Q15.** 100 kg of solution A is mixed with 60 kg of solution B. If solution A has tin and copper in the ratio 1 : 4 and solution B has lead and tin in the ratio 3 : 2, then what is the amount of tin in the new solution?

A. 70 kg |
B. 36 kg |

C. 56 kg |
D. 44 kg |

**Q16.** A purse has Rs. 10, Rs. 5, and Rs. 2 coins in the ratio 9 : 5 : 4 amounting to Rs. 1866. Find the number of Rs. 10 coins in the purse?

A. 15 |
B. 20 |

C. 18 |
D. 16 |

**Q17.** The average age of three friends is 25 years. Their ages are in the proportion 5 : 7 : 3. Find the age of eldest friend?

A. 35 years |
B. 21 years |

C. 18 years |
D. 37 years |