hi can u alert serena that i wud like to talk her. send couple of msgs and txted her also. pls… help

Why is it become 9 and 15? cant understand that…

Before a game, Benson had 3/5 as many marbles as Sharul. During the game, Sharul lost 63 marbles to Benson, after which Benson had twice as many marbles as Sharul. How many marbles did Benson have at first?

:?: Hi all, i am new to this kiasu parents. glad to be meet u all and be one among u.. i had gone thru the forums.. planning to enrol my p4 son for onsponge. but wud like to know more reviews on that coz the fee is 180$ per 1.5hr. does it really help in singapore maths syllabus? becoz i got to know frm them that they are very strictly sticking to the onsponge book. currently my son is with mindstretcher HA maths.. he is very good in maths.. I am in a dilemma to choose btw onsponge /mindstretcher. wud like to hear comments abt onsponge if anybody's kids are already into it.. expecting to hear soon, thanks again :?