1.There are y apple in a box.The weight of the box of apples is 6060 g.It is given that the box weights 300g when it is is empty.If each apple weights 160g,find the value of y.
2.N is a 3-digit number.It is given that N=970+a,where a is an integer between 0 and 9.
(a) If the order of the first and the third digits of the number is reversed to form a new 3-digit number,find its new value in terms of a.
(b) Hence,find the difference between the two 3-digit numbers in terms of a.
(c) Hence,find the value of a if the difference between the two 3-dight numbers
is 594.
3.Given A=1/2(a+b)h.If A=48,b=12 and h=6,find the value of a.
4.Peter has $k and he spends half of his money to buy a toy car.David has $10 fewer than four times the money that Peter has.If David spends all his money to buy the toy car,how many toy cars can David buy?
A. (2k-20)÷k
B. (4k-10)÷k
C. (4k-20)÷k
D. (8k-20)÷k
5.Expand and simplify the following expressions.
(a) 4(a+2b-5)
(b) (a-b)(a-2b)(a-ab+b)