A team consists of both boys and girls along with a coach. After a game, the coach drinks 9 litres of water, a boy drinks 7 litres of water and a girl drinks 4 litres of water. If after a game 42 litres of water was consumed, find the number of boys in the team.
option
(A) 5 boys
(B) 4 boys
(C) 3 boys
(D) 2 boys

• 3 boys
  
  9+ 7x + 4y = 42
  
  x,y are number of boys and girls
  
  7x+4y = 33
  
  the only integers which satisfies this equation are x=3 y=3
• 10 years agoHelpfull: Yes(61) No(0)
• 3 boys...
  3*7+3*4+1*9=42
• 10 years agoHelpfull: Yes(4) No(0)
• 42 litre.coach drink 9 litre remaining 33 litre.If 3 boys means 3*7=21 litres... so remaining 12 litres for 3 girls...
  so answer is 3 boys
  
• 10 years agoHelpfull: Yes(1) No(0)
• do verfication
• 10 years agoHelpfull: Yes(1) No(0)
• the answer is 3 because total useage water is 42 we can substract 9 (coach) then remaining is 33 if each boy drinks 7lit means 7*3=21 then we have 12lit of water it can use by 3 of girls so ans is 3 boys
• 10 years agoHelpfull: Yes(1) No(0)
• 42=4x+7y+9*1
  so by random visualisation 42=3*4+3*7+1*9
  so 3 boys and 3 girls and a coach!!!simple
• 10 years agoHelpfull: Yes(1) No(0)
• Ans:
  3
  
  3 boys-3*4=12
  1coach=9
  3girls-3*7=21
• 10 years agoHelpfull: Yes(0) No(0)
• 3 boys
  3 girls
  1 coach
• 10 years agoHelpfull: Yes(0) No(0)
• 9 ltr by coach...so remaining water=32
  so,
  7x+4y=32
  this equation can hv many sltns bt chkng options....
  5-rejected(bcz 7*5>32)
  3-(7*3=21,remaining 11-not possible bcz 11 is not multiple of 4)
  2-(7*2=14,remaining 18- not possible bcz 11 is not multiple of 4)
  4-(7*4=28,remaining 4-1 girl,satisfied)
  so ans is 4 boys and 1 girl :)
• 10 years agoHelpfull: Yes(0) No(3)
• 9*coach+7*boys+4*girls=42 litres
  if boys=3
  9*1+7*3+4*3=42litres
• 9 years agoHelpfull: Yes(0) No(0)
• 3 is the answer
  coach=42-9=33
  boys=33-7*3=12
  girls=4*3=12
• 9 years agoHelpfull: Yes(0) No(0)
• difference is 120-10=110
• 9 years agoHelpfull: Yes(0) No(0)
• Coach =1********>9
  3Boys=7*3=21
  3girls=4*3=12
  Total=42
  So 3Boys only
• 9 years agoHelpfull: Yes(0) No(0)