CAT Exam Logical Reasoning

12 ,7,5,25,40,65,90, what next?

Read Solution (Total 2)

65-40=25
90-65=25
115-90=25
8 years agoHelpfull: Yes(0) No(2)

Answer is 100.
This one is tricky, but if you observe the differences of consecutive numbers

-5, -2, +20, +15, +25, +35

Here we need to split up according to odd-even places.

Even series: -2,+15,+35 hence next would be +58(observe the difference 17,20,23 hence 35+23). Don't worry, it's for even place, we need answer for odd place.

Odd series: -5,+20,+25 hence differences would be +25,+5 and next would be -15 and hence odd place needs to be filled with +10 (i.e +25–15) .

So at last, we need to add +10 to the last place number to complete the list of differences as follows: -5,-2,+20,+15,+25,+35, +10, +58

The series would be 12,7,5,25,40,65,90, 100, 158

The answer for the question is, hence, 100 .
6 years agoHelpfull: Yes(0) No(0)

CAT Other Question

price of a soap is collectively decided by 5 factors : research, raw materials, labour, ad and transport. assume functional relation is
price of soap = (k x research costs x raw material costs x labour costs x ad costs x transport costs)
if there are resp changes of 10% 20% - 20% 25 % and 50 %, find the change in price of soap After receiving two successive raises Harsh's salary became 15/8 times of his initial salary.By how much percent was the salary raised the first time if the second raise was twice as much as high(in percent) as the first?