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pages # figures
1000 1000 4
from 999 to 100 (999-99)*3 2700
from 99 to 10 (99-9)*2 180
from 9 to 1 (9-0)*1 9
total sum= 2893

55

x+25y=70*25=1750
x+50y=60*50=3000
solve the both
25y=1250
y=50
x=500
500+100*50=>5500/100=55
ans is 55

Nice

I have seen a few say 25% as an answer to this. But looks
like their math isn't good and is extremeley complex to
have an asnwer of 25% to this question. Consider - Rs.1.00/-
per mango; so 40 mangoes = Rs.40.00/-, implies Rs.4.00/-
extra at the end of the deal. So he's left with Rs.44.00/-
after selling 40 mangoes implies a profit of Rs.4.00/- over
Rs.40.00 = 44/40 = 110% which means his profit is 10%.
Hope this helps...
Thanks.

10 percent

150m

C is grand child of A

270

Take 5 pills from jar 1, 4 pills from jar2,.... and 1 pill
from jar 5 and put altogether in the scale. the ideal
weight should be (1+2+3+4+5)x10= 150gms. for eg if the jar2
is contaminated then the weight will be 146 gms. so
depending on the amount of weight loss we can identify the
contaminated jar.

take 1,2,3,4&5 pills from jars 1,2,3,4&5 respectively.the
total weight of the contaminated pills should be a multiple
of 9 & that of normal pills shall be a multiple of 10.
so,if its jar 1 that is contaminated, the last digit of the
total weight of all the pills will be 9,if its jar2 that is
contaminated, then the last digit will be 8,if its jar3 it
will be 7,if its jar4 it will be 6 & if its jar5 it will be
5.

total sum = 205 Rs.