ayesha is correct in all except Q2 where there is a miscalculation but her procedure is correct
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Q.2
a miscalculation by ayesha 
13 * 100/ 20 = 65 %
you mistakenly wrote 80
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Quote:
Q.3
4*3 = 12 which is 4 less than 16(4^2)
generally (X^2) - X + X = X^2
if its 5 less then x= 5 (5*4 =20 which is 5 less than 25(5^2) )
if 6 less then x = 6 (6*5 = 30 which is 6 less than 36(6^2) )
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Quote:
Q.4
she is correct
beacuse if you use 10 then
3m<48 -------> 30<48 (ok)
2m>24-------> 20 > 24 ( wrong)
hence 10 is wrong
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Quote:
Q.5
1 - (.90 *.85 ) = 0.235 = 23.5%
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