what is the sum of the first 100 even numbers

unknown values: s

equation: b = 2 + (100-1)*2

equation: s = (2+b)*100/2

answer: 10100

Find the sum of all the multiples of three between 1 and 100.

unknown values: s

equation: s = (99+3)n/2

equation: 3 + 3(n-1) = 99

answer: 1683

The sum of three consecutive integers is negative 72. Find the numbers

unknown values: n,n+1,n+2

equation: n + (n+1) + (n+2) = -72

answer: -25; -24; -23

120=100(M/10),what is the value of M?

unknown values: m

equation: 120=100(m/10)

answer: 12

12 is 3/4 of what number?

unknown values: n

equation: 12 = 3/4 * n

answer: 16

60 is 140% of what number?

unknown values: x

equation: 60 = 140/100 * x

answer: 300/7 | 42.857

If a-b=b-3=6, what is the value of a?

unknown values: a

equation: a-b = b-3

equation: b-3 = 6

answer: 15

The quotient of a number and -7, decreased by 2, is 10. Find the number.

unknown values: n

equation: n/(-7) - 2 = 10

answer: -84

Nine less than the quotient of a number and 3 is 18. Find the number.

unknown values: n

equation: n/3 - 9 = 18

answer: 81

The sum of a number plus half of itself is 18.75. Find the number.

unknown values: n

equation: n + n/2 = 18.75

answer: 25/2 | 12.5