(a)the current age of Mr Lau’s son
(b)the current age of Mr Lau
12.the money box of Wendy contained some one-dollar coins,tow-dollar coins,five-dollar coins and ten-dollar coins.the total number of coins was 24.given that there were 9 one-
dollar coins,and the number of two-dollar coins was 1 less that of five dollar coins was 2 more than that of ten-dollar coins,find the number of ten-dollar coins, 13. x+[(3x-1)/2]=2x. find the value of x 14. [(p+1)/2]+[(p-1)/3]=1 find the value of p
15. 3+[(a+3)/(a-1)]+{16/[2(a-1)]}=11-[16/(a-1)] find the value of a 16. solve the equation [(-3x)/0.5]+[(3x+2)/0.05]=31.9 17.A school organized the Casual Wear Day for charity. Wayne donated $60.given that
the donation of Wayne was $20 more than 1/3 of that of Yvonne.how much did they donate in total? 18.the number of seats in cinema A was 2/3 of that of cinema B.the two cinemas could accommodate 100 people in total.find:
a)the number of seats in cinema A b) the number of seats in cinema B 19.in Mingo’s money box,there were 10 coins in total.these coins include $2,$5 and $10coins.given that the number of $2 coins was 1 more than half of the number of $5
coins ,and the number of $5 coins was 2 less than 2 times of that of $10 coins.let the number of $ 10 coins be $n. a)set up the equation. A. n+2n+2+1/2(2x-2)+1=10
B. n+(2n-2)+[1/2(2n-2)+1] =10 C. n+2x+[1/2(2n-2)+1]=10 D. n+n-2+[1/2(2n-2)+1]=10 b)find the number of $10 coins.
20.Cindy bought 3 packs of juice and 2 pieces of cakes in a cake shop.she paid $28 in total.if the price of each pack of juice was 1/2 of that of a piecem of cakes.find the price of a piece of cakes
