A) 35 c | B) 36 c |

C) 34 c | D) 32 c |

Explanation:

Monday + Tuesday + Wednesday = 37 x 3 -----------(1)

Tuesday + Wednesday + Thursday = 34 x 3---------(2)

Thursday = 4/5 of Monday ------------------(3)

subtract eqn (1) from (2) we get,

Thursday - Monday = -9

=> Monday - Thursday = 9.......(4)

From (3) & (4), we get

So,Thursday = 36 C

A) 88572 | B) 77854 |

C) 99584 | D) 55654 |

Explanation:

Given a secret is told to 3 persons in 3 minutes.

And if the process continues with each person saying 3 other persons,

In 30 minutes => the rocess for 10 times because each person time is 3 minutes.

Required number of persons =

Now it forms a geometric progression,

Sum to n terms is S=

Here a = 3, r = 3

S =

=> 59048 x 3 /2

= 88572.

A) 175 | B) 145 |

C) 165 | D) 135 |

Explanation:

Let the number of males be 'M'

Let the number of females be 'F'

From the given conditions,

(F-15)=2M.....(i)

F=5(M-45).....(ii)

By solving the equations (1) & (2) we get M = 80

Then substitute M = 80 in (1)

F = 2M + 15

F = 2 x 80 + 15

=> F = 175

Therefore, number of males = 80 and females = 175 in the party.

A) 8 | B) 6 |

C) 5 | D) 3 |

Explanation:

Given teacher drinks 9 ltr

Let number of boys be 'A'.

Let number of girls be 'B'.

Boy drinks 7 ltr and girl drinks 4 ltr

After class total water consumed = 42 ltr

Then,

9 + 7A + 4B = 42

=> 7A + 4B = 33

By trial and error method,

The only integers which satisfy the equation is A = 3 and B = 3

Therefore, number of girls in the class = 3.

A) 54 | B) 64 |

C) 68 | D) 72 |

Explanation:

If number of visitors on 1st, 2nd, 3rd, 4th & 5th day are k, l, m, n & o respectively, then

k + l + m + n = 58 x 4 = 232 ---- (i) &

l + m + n + o = 60 x 4 = 240 ---- (ii)

Subtracting (i) from (ii), we get

o-k = 8 ---(iii)

Given, k/o = 8/9 ----(iv)

So from (iii) & (iv), we get

a = 64, e = 72

Therefore, number of visitors on 5th day is 72.