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11)let the three consecutive numbers be n,(n+1) and (n+2) . Sum of all three numbers =156 => n+(n+1)+(n+2)=156 => 3n+3 =156 => 3n=156-3=153 => n=51 .
Then the numbers are 51,52 and 53 .So the number is 52 as this is divisible by 13 .
12) let the number of boys and girls be 7x and 5x .
Number of boys is 10 greater than the number of girls . 10=7x-5x=2x=> x=5 . Number of boys in the class =7(5) =35 and total number of students in the class =7x+5x=12x= 12(5) =60 .Hope it helps you...
Then the numbers are 51,52 and 53 .So the number is 52 as this is divisible by 13 .
12) let the number of boys and girls be 7x and 5x .
Number of boys is 10 greater than the number of girls . 10=7x-5x=2x=> x=5 . Number of boys in the class =7(5) =35 and total number of students in the class =7x+5x=12x= 12(5) =60 .Hope it helps you...
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