45. A gardener increased area of his rectangular garden by increasing its length by 40% and decreasing its width by 20%. What is the area of new garden?
Apply formula for such area change questions:
(X) + (Y) + (X) (Y) / 100
Here X = +40% Y= -20% so change in area would be
(+40) + (-20) + (+40) (-20) /100 = 40-20-8 = +12% (Area will be INCREASED by 12% !)
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44. Income of A is 20% higher than that of B. Income of B is 25% less than that of C. What % less is A's income than that of C?
Change all such %age questions in p/q format , then workout with LCM method reverse engineering.
20% =1/5 , 25% = 1/4
5 and 4 ka LCM = 20 Assume this as C income
So C=20 units then B= 20×3/4=15 units
B=15 units then A= 15×6/5= 18 units
So A/C %age = (20-18)/20 ×100 = 10% !
@Yo_Yo_Choti_Singh These shortcuts are very less time consuming.
1. Practice makes u more perfect.
2. CSAT m time issues bhut kam hotey h if you know the basic techniques of attempting questions.
3. These are SSC shortcuts - converting in p/q form and LCM method makes calculation very easy and less error prone. 8×4=32 type calculations will cause less errors vis a vis 0.8×0.4 kind calculations under tensed environments.
4. But yes you need to practice well to get more perfection in these !
