數學問題(English)

1)If 10m+n=10n+m,suggest two pairs of possible values of m and n.

2)In the equationAB+AC=BB,each letter represents an integer from 0 t 4.Different letters represent different integers.Suggest one value for each letter which satisfies the equation.

3)Compelete the following equation using directed numbers.
(- [ ]+4)-([ ]+6)=10

4)The origanal weights of Chris and Anna were 72kg nad 66kg reseatively.After jioning a slimming programme,both of them lost some weight.If Chris lost 20% of his weight,what is the possible percentage decrease in Anna 's weight so that the difference between their weights is less than 4kg?

5)If P is a point on the x-axis,then the y-coordinate of P is__________.

6)The coordinates of the origin=_________.

7)The distance beween the points(x,y)and (-x,y)is____________.

8)5m-5-2(2m+1)=___________. (Simplify the following algebraic expressions)

9)In a school,50% of girls wear glasses while 280 of boys wear glasses.If the number of girls wearing glassesis 7分之2of the number of boys.Find the number of girls.

10)John spends one-third of his money to buy a toy.Then he spends $20 for food.If he spends $37 in total,how much money does he have at the beginning?
Lrt thr money he has at the beginning be $x.