Arvind, a mason, decided to build a small house. For constructing the house he had to mix gravel, sandand cement in the ratio 7:5:3. The cement costs Rs.250 a bag which contains 10 kg of cement. He hasspent Rs.4500 to buy cement. How much will he have to spend for sand which costs Rs.70 for a 20 kgbag?(a) Rs.1050 (b) Rs.2050 (c) Rs.1075 (d) Rs.2000

• cost of cement=Rs 4500
  so wt. of cement required to construct house= (4500/250)*10= 180 Kg
  now, total wt of material can be evaluate from following equation:
  3x/15=180 kg
  so,
  x=900kg
  hence total material req.=900kg
  wt of sand used= 5/15 * 900= 300kg
  cost of sand=70/20 * 300 =Rs 1050
• 12 years agoHelpfull: Yes(24) No(0)
• 4500/250=18 bags of cement=180 kg of cement,
  cement : sand=3:5,
  (180/3)=((20kgs*x bags)/5),
  x=15bags=15*70=1050/-
• 12 years agoHelpfull: Yes(5) No(3)
• 1050 is correct.
  
  For 10*4500/250 = 180 kg cement, you need 300 kg sand.
  @ Rs 70 for 20 kg back, amt to be spent on sand = 70*300/20 = 1050.
• 12 years agoHelpfull: Yes(4) No(2)
• cement= 4500rs=180kg
  total material=840kg
  sand=300kg=1050rs
  that means 1050 is correct
• 12 years agoHelpfull: Yes(4) No(3)
• 4500/250=18
  3/15*x=180
  x=5*180
  5/15*5*180=5*60=300
  300/20=15
  15*70=1050
• 12 years agoHelpfull: Yes(1) No(0)
• ans given is (b) but my ans is (a) i.e. Rs.1050
• 12 years agoHelpfull: Yes(0) No(2)
• @garima please explain the logic behind the sum"How many 3-digit numbers have even number of factors?"...i have asked earlier
• 12 years agoHelpfull: Yes(0) No(0)
• @garima can u explain where the 300kg came from?
  
• 12 years agoHelpfull: Yes(0) No(0)