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Newton
Euclides
Euler
Marie Curie
Pythagoras
100

a number plus six

x+6

100

a number minus a number

x-y

100

a number plus 4


x+4

100

3 plus a number

3+x

100

Ten altogether with a number 

10+x

200

any number plus three

x+3

200

The addition of a number and 6

x+6

200

Sixteen added by twice a number

16+2x

200

a number reduced by six

x-6

200

Any number reduce twice the number

x-2x

300

five added with a number


5+x

300

Double a number minus eight

2x-8

300

Any number added by five

x+5

300

a number plus double the same number

x+2x

300

A number increased by triple the number

x+3x

400

6 added with a number

6+x

400

Marco's age plus Fran's age 

x+y

400

Any number plus four

x+4

400

A number decreased by twice a number

x-2y

400

Twice a number decreased by seven plus the same number 

2x-7+x

500

triple a number decreased by seven

3x-7

500

Seventeen decreased by triple a number 

17-3x



500

Six times a number plus two minus the same number

6x+2-x

500

any number added plus triple another number

x+3y

500

The speed of something pus 15

x+15